✅ Medically reviewed by Dr. Thomas Biernacki, DPM — Board-Certified Podiatrist · Last updated April 6, 2026

Mole Under the Toenail or Fingernail[Causes, Diagnosis & Best Treatment!]

A Mole Under the Toenail or Fingernaill can be a dangerous melanoma. Make 100% sure that you are not ignoring something dangerous and thinking it is fungus!

Black mole under the big toenail melanoma video:

Always check with your podiatrist if you are concerned regarding toenail cancer. Do not just rely on these videos or articles. A biopsy may be the best and only way to rule out a dangerous mole or cancer under your toenail.

Black underneath the toenail causes:

Is It Dangerous?

How to tell if you are safe from A Mole Under the Toenail or Fingernail:

Probably safe (but should still visit the podiatrist) if:

• The streak is less than 3 millimeters in width.
• The streak is uniform in length and of continuous color as it progresses down the nail.
• The streak or pigment is only present in the nail and not in the skin.
• The nail is not deformed, bloody, or cracked in that area.
• The nail looks normal compared to the other nails.

Visit a podiatrist for a biopsy immediately if:

• The black streak is over 3 millimeters in width.
• The streak is widest at the start of the nail origin.
• The streak is not uniform or appears disrupted.
• The streak changes color the further you get.
• The streak continues from under the nail into the skin, termed “Hutchinson’s sign.”
• The nail becomes deformed, bloody, or starts to crack in the area of the streak.
• The nail looks very unusual compared to the other nails.
• The streak is more common in the thumb and the big toe.
• The streak may even be white; in this case, be aware of a nodule or irregularity forming under the nail plate.
• If you have ever considered that there may be a wart underneath your nail that is just not healing.

What is the dangerous cause:

• The most dangerous cause is something called melanoma.
• This is a type of skin cancer that can occur underneath the big toe joint.
• The best way to tell if you have melanoma is that it is enlarging, growing in size, and connecting from underneath the toenail onto the skin.
• If your toenail is detached, you will not have pigment changes throughout the skin surrounding the toe.
• A melanoma will also not grow with the toenail.
• If the black spot is associated with a loose nail or the toenail growing out, this is more likely to be a bruised or damaged toenail.

What makes a melanoma more likely?

• Melanoma is a skin problem, not a toenail problem.
• If the skin pigmentation extends beyond the toenail, this is a big sign that you have a melanoma.
• If it grows into the cuticle, this is a sign of melanoma.
• If the melanoma is getting worse over time rather than better, then this is a clear sign that it is not the toenail problem.
• If you suspect a melanoma see your podiatrist or dermatologist immediately.

Causes of a Black Toenail:

1)Runner’s Toe:

• The runner’s toe occurs if the toenail is rubbing against the front of the shoe.
• Even if it is not really painful, blood could accumulate in leakage or blistering under the nail.
• This page is dedicated to treating the runner’s toe.

Treatment:

• We list numerous products below on how to treat runner’s toes.
• The most important thing is getting a shoe that fits better and keeps pressure off your toes.
• Runners’ toe is secondary due to repeated trauma and injury.
• Click this link to follow our runners-toe treatment guide.

2)Traumatic Injury:

• A big bump can cause your toenail to loosen.
• This is not the most likely cause. Multiple smaller irritations to the toenail are more likely to make this happen.

Treatment:

• If you have a traumatic injury to your big toenail, the most important thing is to ensure that you don’t have a broken toe.
• If the toenail is loose and falling off, it may be in your benefit to let a podiatrist from it and apply antibiotic ointment.
• It is important to make sure that there is no exposed bone underneath the toenail.
• If there is exposed bone, you may be at risk for bone infection.

3)Melanoma:

• If you have an unusual streak of black pigment that is pain-free and just appeared over without any incident.
• For More Resources: Melanoma Guide.
• Melanoma is a type of skin cancer that can become malignant and spread.
• This is the most dangerous type of skin cancer.
• The doctor that treats a foot melanoma is a dermatologist and is usually diagnosed earlier by a podiatrist.
• Always be sure and see your doctor!

4)Toenail fungus:

• If your nails gradually become thick, discolored, and crumbly under the border, then read our comprehensive guide to toenail fungus.
• Toenail fungus is potentially the most common cause of toenail starting to loosen and come off the taupe.
• We put together a comprehensive guide with toe fungus products below.

Best Toenail Fungus Products:

• These are our favorite products to treat toenail fungus at home.
• Keratin Granulations are very easily taken care of through moisturizing your nails with cuticle wax, oils and simply avoiding nail polish for a little while.
• It is not necessary to buy anything expensive or online; it is fine to simply use a product like Vaseline or any other petroleum oil in most circumstances.
• So get yourself some petroleum jelly at your corner store and apply it to your nails at night when you won’t be using your hands. In 2 weeks, you should be in great shape!
• Make sure you read the reviews and see if it is good for you!

Caring for a Bruised or Discolored Toenail at Home

A discolored or bruised nail (subungual hematoma) usually comes from blunt trauma — a dropped object, a tight shoe box, or repetitive impact from running. The discoloration is trapped blood under the nail plate, and in most cases it will grow out on its own over 6–12 months. You do not need a fungus treatment for trauma discoloration — antifungals won’t change the color and can delay the right evaluation.

At home, keep the nail area clean and dry, trim the nail straight across as it grows, and protect the toe from further impact with a gel toe cushion or Foot Petals sleeve. If the nail is throbbing painfully within the first 48 hours of injury, that’s a sign pressure is building under the plate and it needs drainage — call our office, don’t drill it yourself. For topical soreness around the nail fold, Dr. Hoy’s Natural Pain Relief Gel is a gentle menthol-arnica option.

When to See a Podiatrist for a Discolored Nail

Book an evaluation if: the dark area doesn’t move outward with nail growth, the streak is a single vertical line, there’s no history of injury, the nail is lifting off the bed, or you see dark pigment on the skin around the nail. These can signal something beyond a simple bruise. Call Balance Foot & Ankle at (810) 206-1402 or book a same-day evaluation.

Best Toenail Fungus Clippers & Files:

• This is something you have to be careful using at home, and deftly don’t use these if you have dangerous health conditions.
• These are some great value heavy-duty clippers and sets.
• The key is to cut straight across and file the nail down from the top to prevent impinging in the corners.
• It is also important to make sure all dead, dry skin is removed surrounding the foot.
• This is where you should really see your podiatrist if you have any concerns or are worried about cutting or hurting yourself.
• This is something covered, so don’t take chances with your health!

Best Grooming Supplies

Best Value Clipping Set

Best Value Heavy Duty Clipper Set

Heavy Duty Non-Scissor Clipper

Price:

$9.99

$21.99

$22.99

Overview:

This is the Amazon best overall rated value set: Great Reviews and cost.

Value heavy duty clipper, nail file and currette for scooping under the nail.

Great alternative choice for heavy duty clipper if difficulty cutting with the other one.

Pros:

4.4/5 ratings at almost 800+ ratings. Multi-tool set that should be adequate for most people.

4.7/5 reviews with 200+ reviews. Strong clipper with files and currette, everything you need!

Excellent reviews, 4.8/5 with 600+ reviews. Some people prefer this grip

Cons:

It won’t work for heavy duty thickness. It can be dangerous clipping if you have health conditions.

It is still not perfect if you can’t reach your foot. See your podiatrist if health conditions.

No currette and no nail file, so you may need this.

Crucial Tips:

If your toenails are too thick and if you have dangerous health conditions, see your podiatrist for your toenail fungus!

If you have health conditions, be very safe at home, this can be a risky treatment! Be very safe.

Make sure to see your podiatrist if you have metabolic or blood flow conditions! Be safe if you can’t reach.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Buy on Amazon

Buy on Amazon

Best Grooming Supplies

Best Value Clipping Set

Price:

$9.99

Overview:

This is the Amazon best overall rated value set: Great Reviews and cost.

Pros:

4.4/5 ratings at almost 800+ ratings. Multi-tool set that should be adequate for most people.

Cons:

It won’t work for heavy duty thickness. It can be dangerous clipping if you have health conditions.

Crucial Tips:

If your toenails are too thick and if you have dangerous health conditions, see your podiatrist for your toenail fungus!

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Grooming Supplies

Best Value Heavy Duty Clipper Set

Price:

$21.99

Overview:

Value heavy duty clipper, nail file and currette for scooping under the nail.

Pros:

4.7/5 reviews with 200+ reviews. Strong clipper with files and currette, everything you need!

Cons:

It is still not perfect if you can’t reach your foot. See your podiatrist if health conditions.

Crucial Tips:

If you have health conditions, be very safe at home, this can be a risky treatment! Be very safe.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Grooming Supplies

Heavy Duty Non-Scissor Clipper

Price:

$22.99

Overview:

Great alternative choice for heavy duty clipper if difficulty cutting with the other one.

Pros:

Excellent reviews, 4.8/5 with 600+ reviews. Some people prefer this grip

Cons:

No currette and no nail file, so you may need this.

Crucial Tips:

Make sure to see your podiatrist if you have metabolic or blood flow conditions! Be safe if you can’t reach.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Toenail Fungus Polish and Remover:

• There is some great toenail fungus polish options and polish removal options.
• There are no acetone-based toenail polish removers, they don’t dry as quickly, but they are less like a dehydrator toenail.
• This also applies to your fingernails and hands.
• The benefits of using these non-toxic toenail polishes are filled with non-fungal options such as tea tree oil which prevent the spread of toenail fungus.
• These can also work well for the fingernails.
• So great combo is to use one of these healthier toenail paint options, as well as a non-acetone-based toenail polish remover.

Non-Toxic Toenail Polish

Great Non-Acetone Toenail Polish Remover

Great Clear Topcoat & Anti-fungal Toenail Polish.

Nail file and removal equipment set.

Price:

$11.99

$19.95

$8.99

Overview:

Great non-toxic and non-acetone toenail remove. Great budget price with removal.

Great reliable brand that is combined with non-toxic and anti-fungal ingredients.

Great reviews and value for toenail polish remover with nail file.

Pros:

Great reviewed product: 4.4/5 with 1600+ reviews. No acetone.

Tea tree oil base. Great reviews at 4.4/5 with over 200+ ratings. Great brand.

Great reviews at 4.4/5 with 270 ratings. Includes nail files which are important.

Cons:

There are some questions about what organic really means for this brand. Some prefer the faster drying of acetone.

Some compliants of it getting thick if not sealing it properly.

More of a value budget set.

Crucial Tips:

Some prefer the quicker drying of acetone, but this works better if you are having drying and fungus issues.

If you still use acetone, it may still dehydrate.

The key is after removal, the nail files are useful for removal dry superficial nails and keratin granulations.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Buy on Amazon

Buy on Amazon

Non-Toxic Toenail Polish

Great Non-Acetone Toenail Polish Remover

Price:

$11.99

Overview:

Great non-toxic and non-acetone toenail remove. Great budget price with removal.

Pros:

Great reviewed product: 4.4/5 with 1600+ reviews. No acetone.

Cons:

There are some questions about what organic really means for this brand. Some prefer the faster drying of acetone.

Crucial Tips:

Some prefer the quicker drying of acetone, but this works better if you are having drying and fungus issues.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Non-Toxic Toenail Polish

Great Clear Topcoat & Anti-fungal Toenail Polish.

Price:

$19.95

Overview:

Great reliable brand that is combined with non-toxic and anti-fungal ingredients.

Pros:

Tea tree oil base. Great reviews at 4.4/5 with over 200+ ratings. Great brand.

Cons:

Some compliants of it getting thick if not sealing it properly.

Crucial Tips:

If you still use acetone, it may still dehydrate.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Non-Toxic Toenail Polish

Nail file and removal equipment set.

Price:

$8.99

Overview:

Great reviews and value for toenail polish remover with nail file.

Pros:

Great reviews at 4.4/5 with 270 ratings. Includes nail files which are important.

Cons:

More of a value budget set.

Crucial Tips:

The key is after removal, the nail files are useful for removal dry superficial nails and keratin granulations.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Antifungal Moisture Wicking Socks:

• These are some great options for moisture-wicking socks.
• We tried to focus on budget value stocks that are not too expensive.
• Sure there are better stocks out there, but these are great socks for a great price for most people.
• If you have diabetes, focus on getting yourself some diabetic socks.

Best woman’s antifungal socks:

Best Women’s Anti-Sweat & Anti-Fungus Socks

Great choice for women’s running socks with moisture wicking design.

Best Seller & Most Reviewed Crew Socks

Best Overall Women’s Dress Sock

Great reviewed crew length bamboo sock.

Price:

$13.98

Price not available

$23.99

$14.99

Overview:

Ankle height socks, great for running with moisture wicking design, great company.

This is a great reviewed budget crew sock. It has more cushion and bulk than the running sock.

Great overall full length dress socks, great reviews and good overall price.

This is a great alternative to the other crew sock. Great reviews.

Pros:

4.7/5 reviews with over 5,000+ reviews! Great reliable company with great reviews.

The best seller for moisture wicking women’s socks. Great reviews at 4.2/5 with over 3,000+ reviews.

Great reviews 4.4/5, which suprisingly is better than most dress socks. Excellent overall choice.

Very well reviewed sock: 4.4/5 rating and over 700+ reviews.

Cons:

These are thinner and more likely to curl/fall apart.

Not the world’s most expensive socks. Main complaints are the durability long term.

Dress socks are less durable than crew socks. They can work well.

Not much downsides. Good overall sock.

Crucial Tips:

Not as well cushioned as other socks. Make sure to combine with a good supportive orthotic and breathable sock.

These are great everyday socks. Combine with good breathable shoes and orthotics for best results.

Make sure to get a good 3/4 length dress orthotic or dress shoe orthotic with a good shoe.

Make sure to combine with a good breathable shoe and supportive orthotics.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Buy on Amazon

Buy on Amazon

Buy on Amazon

Best Women’s Anti-Sweat & Anti-Fungus Socks

Great choice for women’s running socks with moisture wicking design.

Price:

$13.98

Overview:

Ankle height socks, great for running with moisture wicking design, great company.

Pros:

4.7/5 reviews with over 5,000+ reviews! Great reliable company with great reviews.

Cons:

These are thinner and more likely to curl/fall apart.

Crucial Tips:

Not as well cushioned as other socks. Make sure to combine with a good supportive orthotic and breathable sock.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Women’s Anti-Sweat & Anti-Fungus Socks

Best Seller & Most Reviewed Crew Socks

Price:

Price not available

Overview:

This is a great reviewed budget crew sock. It has more cushion and bulk than the running sock.

Pros:

The best seller for moisture wicking women’s socks. Great reviews at 4.2/5 with over 3,000+ reviews.

Cons:

Not the world’s most expensive socks. Main complaints are the durability long term.

Crucial Tips:

These are great everyday socks. Combine with good breathable shoes and orthotics for best results.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Women’s Anti-Sweat & Anti-Fungus Socks

Best Overall Women’s Dress Sock

Price:

$23.99

Overview:

Great overall full length dress socks, great reviews and good overall price.

Pros:

Great reviews 4.4/5, which suprisingly is better than most dress socks. Excellent overall choice.

Cons:

Dress socks are less durable than crew socks. They can work well.

Crucial Tips:

Make sure to get a good 3/4 length dress orthotic or dress shoe orthotic with a good shoe.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Women’s Anti-Sweat & Anti-Fungus Socks

Great reviewed crew length bamboo sock.

Price:

$14.99

Overview:

This is a great alternative to the other crew sock. Great reviews.

Pros:

Very well reviewed sock: 4.4/5 rating and over 700+ reviews.

Cons:

Not much downsides. Good overall sock.

Crucial Tips:

Make sure to combine with a good breathable shoe and supportive orthotics.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best men’s antifungal socks:

Best Men’s Anti-Sweat & Anti-Fungus Socks

Best Budget & Well Reviewed Moisture Wicking Socks

Best ankle sock length Men’s running socks, moisture wicking.

Price:

Price not available

Price not available

Overview:

These have a HUGE amount of great reviews, great cost men’s work socks.

Great overall budget reviewed choice for running socks at the ankle level.

Pros:

21,000+ reviews at 4.7/5! Excellent reviews at a great cost, you can’t go wrong.

2,500+ reviews at 4.5/5! Excellent reviews and specifically designed for moisture wicking, great company.

Cons:

Not much downsides, some durability concerns, but these seem to be overblown.

Shoe ankle socks can curl. Fabric is thin.

Crucial Tips:

Make sure to keep your shoes clean as well with antifungal sprays. Combine with clean shoes.

This is thin fabric, while is does wick moisture well, this can make it fall apart faster. It also gives less cushion.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Buy on Amazon

Best Men’s Anti-Sweat & Anti-Fungus Socks

Best Budget & Well Reviewed Moisture Wicking Socks

Price:

Price not available

Overview:

These have a HUGE amount of great reviews, great cost men’s work socks.

Pros:

21,000+ reviews at 4.7/5! Excellent reviews at a great cost, you can’t go wrong.

Cons:

Not much downsides, some durability concerns, but these seem to be overblown.

Crucial Tips:

Make sure to keep your shoes clean as well with antifungal sprays. Combine with clean shoes.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Men’s Anti-Sweat & Anti-Fungus Socks

Best ankle sock length Men’s running socks, moisture wicking.

Price:

Price not available

Overview:

Great overall budget reviewed choice for running socks at the ankle level.

Pros:

2,500+ reviews at 4.5/5! Excellent reviews and specifically designed for moisture wicking, great company.

Cons:

Shoe ankle socks can curl. Fabric is thin.

Crucial Tips:

This is thin fabric, while is does wick moisture well, this can make it fall apart faster. It also gives less cushion.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Recommended foot fungus products:

• It is also essential to fix your foot fungus.
• Even if you cure your toenail fungus, keep your toenails trimmed in healthy: your foot fungus can spread back into toenails.
• It’s not a far journey from skin fungus to jump onto your toenails again.
• So make sure you treat your foot fungus, as well as your toenail fungus.

Best Foot Fungus Products

Best Foot Powder Option For Shoes.

Best Shower Body Wash

Best choice for Foot Bath Mix

Best & Most Cost Effective Foot Soak Tub.

Price:

$26.31

$18.04

$17.65

$18.97

Overview:

3 pack of foot powder spray. This is great for shoes and feet, but not as practical outside the foot or shoe.

Great cost effective shower wash.

Mix of epsom salts, tea tree oil for a good price.

This is a cost effective tub for foot soaks. You still need to also buy a foot soak powder or solution!

Pros:

If you sweat in your shoes, this is your best bet. This will soak up sweat and kill fungus. Very effective and excellent Amazon reviews. 3 pack online is the price of one bottle at the store.

Over 5,000 5 star amazon reviews. Great reviews, medically proven component in tea tree oil. All natural with excellent results.

Epsom salts and tea tree oil have proven effect. Epsom salts make your loose skin flake off and tea tree oil is anti-fungal. Great price and near 5 star review on Amazon.

Excellent choice for cost effective foot soak tub. Top notch reviews on amazon, great price.

Cons:

Powder makes a big mess. Good for shoes but it can get powder inside your shoes. Can have chemical like smell.

Can be more expensive than regular soap. It may not be enough by itself without soaking or especially further toenail treatment.

Foot soak by itself may not be enough to fix your problem, but a component. You also need a foot tub.

Not much downsides, it’s a tub! But you have to get foot soak powder or antifungal solution separately.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Buy on Amazon

Buy on Amazon

Buy on Amazon

Best Foot Fungus Products

Best Foot Powder Option For Shoes.

Price:

$26.31

Overview:

3 pack of foot powder spray. This is great for shoes and feet, but not as practical outside the foot or shoe.

Pros:

If you sweat in your shoes, this is your best bet. This will soak up sweat and kill fungus. Very effective and excellent Amazon reviews. 3 pack online is the price of one bottle at the store.

Cons:

Powder makes a big mess. Good for shoes but it can get powder inside your shoes. Can have chemical like smell.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Foot Fungus Products

Best Shower Body Wash

Price:

$18.04

Overview:

Great cost effective shower wash.

Pros:

Over 5,000 5 star amazon reviews. Great reviews, medically proven component in tea tree oil. All natural with excellent results.

Cons:

Can be more expensive than regular soap. It may not be enough by itself without soaking or especially further toenail treatment.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Foot Fungus Products

Best choice for Foot Bath Mix

Price:

$17.65

Overview:

Mix of epsom salts, tea tree oil for a good price.

Pros:

Epsom salts and tea tree oil have proven effect. Epsom salts make your loose skin flake off and tea tree oil is anti-fungal. Great price and near 5 star review on Amazon.

Cons:

Foot soak by itself may not be enough to fix your problem, but a component. You also need a foot tub.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Best Foot Fungus Products

Best & Most Cost Effective Foot Soak Tub.

Price:

$18.97

Overview:

This is a cost effective tub for foot soaks. You still need to also buy a foot soak powder or solution!

Pros:

Excellent choice for cost effective foot soak tub. Top notch reviews on amazon, great price.

Cons:

Not much downsides, it’s a tub! But you have to get foot soak powder or antifungal solution separately.

Affiliate Link (Buying through these links will connect you to Amazon):

Buy on Amazon

Get The Best Shoes:

• You definitely want to get great shoes and sandals for your toenail fungus and foot fungus.
• Specifically, when you are in a communal shower or pool, you want to get a good pair of sandals. We compiled a great list of our recommended orthotic flip-flops.
• You also want to get new breathable shoes that are not covered in sweat and mesh around the toes.
• Specifically, good pairs of running shoes have a mesh where your toes are. This prevents your toenails from rubbing and prevents them from dreaming on the front of the foot.
• Click on the below link to see which shoes we recommend for your toenail fungus and foot fungus.

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Related Treatment Guides

• Plantar Fasciitis & Heel Pain Treatment
• Custom 3D Orthotics
• Sports Foot & Ankle Injury Treatment
• Bunion Treatment

Clinical References

1. Tosti A, Piraccini BM, de Farias DC. Dealing with melanonychia. Seminars in Cutaneous Medicine and Surgery. 2009;28(1):49-54.
2. Di Chiacchio N, Hirata SH, Enokihara MY, et al. Dermatologists’ accuracy in early diagnosis of melanoma of the nail matrix. Archives of Dermatology. 2010;146(4):382-387.
3. Perrin C, Michiels JF, Pisani A, Ortonne JP. Anatomic distribution of melanocytes in normal nail unit: an immunohistochemical investigation. American Journal of Dermatopathology. 1997;19(5):462-467.