Painful Lump on the Bottom of Your Foot?
What’s Causing That Hard Painful Knot on Bottom of Foot?
Unequal leg length, also known as leg length discrepancy (LLD), is a common condition that can affect posture, walking, and even cause chronic pain. Whether you’re noticing hip discomfort, back pain, or wearing down one shoe faster than the other, you might be dealing with a difference in leg length. Fortunately, this condition is both measurable and manageable—with the right diagnosis and treatment. Read on to explore what causes unequal leg length, how to identify symptoms, and what treatments can help restore your balance.
Understanding the Common Causes of Hard Painful Knots on the Foot
There are several conditions that can cause a hard, painful lump on the bottom of the foot:
- Plantar Fibroma: A non-cancerous growth in the arch of the foot’s plantar fascia ligament.
- Ganglion Cyst: A fluid-filled lump that may press on nerves, causing pain.
- strong data-start=”1394″ data-end=”1413″>Inclusion Cyst: Can result from repetitive trauma or a puncture wound.
- Lipoma: A fatty tissue lump, usually soft but can feel firm if deep.
- Heel Spurs or Calluses: Hardened tissue due to pressure or misalignment.
Pain can worsen with standing, walking, or wearing tight shoes. Leaving the issue untreated can lead to gait changes, further pain, and joint problems.
Hard Painful Knot on Bottom of My Foot Causes & Best Treatment
A hard painful knot on the bottom of your foot can be plantar fasciitis, but can also be a plantar fibroma! Find out the 100% most effective treatment options.
Get Expert Care for Foot Lumps and Pain Today
At Balance Foot & Ankle, our expert podiatrists, including Dr. Tom Biernacki, provide accurate diagnosis and treatment for painful foot conditions. Whether it’s a fibroma, cyst, or another cause, we offer non-surgical and surgical solutions tailored to your needs. Call today or book an appointment in Howell or Bloomfield Hills, Michigan, and take your first step toward relief.
Call now or book an appointment online—your peace of mind starts here.
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Knot on Bottom of Foot in Arch Causes:

Heel Pain Causes: Picture & Photo Gallery
Look:
- One of the top causes of heel pain is plantar fasciitis. This is damage to a ligament that holds your heel to your toes.
- Another root cause of heel pain has flat feet.
- There are also photos of heel spurs that can occur to the bottom of your heel (plantar fascia insertion) and the back of your heel (Achilles tendon insertion).
- Baxter’s nerve entrapment can also happen at the bottom of the heel.
- An underlying cause is an overpronated flatfoot or an over a supinated high arched foot.
- A plantar fibroma is a thick nodule that can occur within your plantar fascia ligament and contribute to plantar fasciitis.
- This can lead to the formation of a heel stress fracture( AKA calcaneus stress fracture.)
Please click on the gallery for a guided tour through heel pain conditions!
Hard Painful Knot on Bottom of Foot on the Bottom of My Foot Overview:
- A hard, painful knot on the bottom of your foot can be plantar fasciitis but can also be a plantar fibroma!
- We go over the 100% most effective treatment for plantar fibroma and plantar fasciitis pain.
- We go over the top causes of knots and bumps on the bottom of the foot.
- We also review the symptoms.
- We then go over the best home treatment and the best products for treating your plantar fibroma!
What is a Plantar Fibroma?
- A plantar fibroma is a thick fibrous knot or nodule which develops in the arch of the foot.
- The plantar fibroma develops within the plantar fascia, which is a band of thick cord that attaches from your heel to the area around the toes in the bottom of the foot.
- This fibroma can develop on just one or both feet. It can develop in numerous sponsoring just one spot. In some cases, it can be enormous the size of a golf ball or can be tiny, almost like BBs.
- The plantar fibroma is not considered malignant(This means less dangerous). This means that it is not cancerous. Although, to be 100% sure, it makes sense to biopsy if it has suspicious characteristics.
- This can be a challenging problem to go away. Very frequently, low-level treatments do not get the job done.

We like to think of a plantar fibroma, almost like pair with scar tissue throughout the plantar fascia. The more you keep walking on it, the more swollen and agitated it gets. It fills up with more fluid and causes more pain.
Causes:
- There are no obvious causes of a plantar fibroma.
- We personally like to think of it almost like scar tissue that develops in the band of tissue. The more stress and fraying of your plantar fascia that you have, this is more likely to be associated with a plantar fibroma.
- There is a clear association between people who have plantar fashion pain and have plantar fibromas.
- Although it is common to have plantar fascia pain without developing a plantar fibroma, most people with plantar fasciitis do not develop a plantar fibroma.
- In summary, there is no definitive improvement cause.

Signs and symptoms:
- These generally appear as a thickened and noticeable lump in the arch of the foot.
- A plantar fibroma can feel firm to the touch, but it can generally be somewhat movable if you press it with your thumb and fingers.
- This plantar fibroma can stay the same size or can get larger and develop and spread for some people.
- Some people who have plantar fibromas have pain, but others do not have any pain. Pain is usually mechanical in nature. This means that the more you walk on this not, the more bruising it will cause for you.
- This pain is usually associated with hard surfaces pushing the bump against the soft tissues in your skin. For example, people who stand barefoot on hard surfaces will certainly have a lot more pain than someone with a very thick protective fat pad who stands on the carpet or since all day.

Diagnosis of a Plantar Fibroma:
- Your podiatrist will likely examine your foot and press and evaluate the area to diagnose a plantar fibroma.
- By assessing the consistency of the nodule, you can tell whether it is just the plantar fascia pain or a true nodule.
- In our office, we like to use an ultrasound almost immediately to evaluate this nodule and see if this is what it really is.
- An MRI may be needed in some cases for plantar fibroma diagnosis
- If there is suspicious growth, a biopsy may be needed to assess it further.
Causes Of A Knot In Arch Or Heel Of Foot:
For all causes beyond a plantar fibroma, consider the following options:
1. Plantar Fasciitis:
- This is the most common source arch & bottom of the foot knots.
- Inflammation can cause your arch ligaments to swell.
- This leads to stiff & aching morning pain.
- This is not a very hard lump, but a big swollen hard area.
- It can feel similar to the muscles in your neck when they are sore.
- This is much more common but less of a hard lump than a plantar fibroma.
2. Plantar Fibroma:

- A fibroma is a concentration of connective tissue.
- This usually starts with trauma but can occur for any reason.
- This is more of a hard nodule than just a muscle knot.
- This can feel like a hard pebble just under your skin.
- It can range from 2mm to 5 cm!
- It could be one bump or multiple bumps.
- They are usually non-painful, but as you walk on them, they start to hurt!
3. Foot Bump Cancer:

- This is very, very rare.
- If you have a hard discrete bump, it is likely a fibroma or plantar fasciitis.
- But even if it is scarce, MRI or X-ray should rule out this very dangerous tumor.
4. Ganglionic Cyst:

- Ganglion cysts are swellings of fluid.
- They are usually near foot joints.
- The most common is the big toe joint, the middle of the foot, and the ankle.
- A cyst, by definition, is a sac filled with fluid, and it can feel hard or soft.
- These are usually not dangerous.
5. Outside OF The Foot Bump:

- Outside of the foot, bumps are also very common.
- They can be both on the outside and the bottom of the foot.
- This can be a bump by your pinky toe, along the outside middle of the foot of the outside heel.
- These are usually hard bone-type knots.
If The Foot Knot Is More Of a Hard Nodule Or Pebble:
This is almost always caused by a formation of hard connective tissue known as a plantar fibroma.
- A plantar fibroma is a genetic condition that is not dangerous.
- But it can be painful and irritating!
- It is sporadic cancer, but if worried, you should check it out.
- But a plantar fibroma is not dangerous at all.
- You can think of it simply as a “pebble” that is stuck under your skin.
- By walking on it, it eventually does cause pain.
Best Plantar Fibroma Products:
- There are usually two phases to treating plantar fasciitis pain.
- The two phases of treatment include controlling the acute inflammation and correcting the biomechanics, which led to the problem in the first place.
- If the tendons and ligaments are inflamed, they are almost frozen in place and cannot function properly.
- Once the inflammation is decreased, we need to correct the biomechanical causes to ensure that they can never become overworked and inflamed again!
- This doesn’t matter whether it’s plantar fasciitis, plantar fibroma, the sore bottom of the foot, or even Achilles tendon pain. Treatment is all roughly very similar.
Plantar Fibroma Cure & Natural Treatment:
Massage & Ice Products:
- Ice is an excellent option that can be safe for almost everyone.
- There is some debate about whether icing is worth doing, but this can help limit the need for medications and keep your options open for chronic pain.
- This works great for your arch, less for the ball of the foot.
- Manual massage on the plantar fibroma is a natural treatment that can also be considered physical therapy for your plantar fibroma.
- This works to break up the plantar fascia nodule. This works well for small plantar fibroma nodules.
- The more muscle and ligament tissue there is, the better ice will work there.






Menthol Based Gels:
- Biofreeze is one of our favorites.
- These gels have been studied to work 2x as long as ice.
- This works great for the ball of the foot.
- This can be very effective for pain relief, but this will not make the actual nodule disappear.








Massage Sticks:
- These can work great for loosening your muscles.
- This allows less tightness and pressure onto the plantar fascia and heel.
- This is very effective for the arch, the gastrocnemius, calf muscle, and the hamstring and thigh muscles.
- This also works very well for the gluteus muscles if you are having butt cheek or hip pain.
- The massage stick can break up lumps in your plantar fascia and small plantar fibroma nodules.






Remove the Plantar Fascia Stress:
- The key is to prevent future pain stress and trauma to the plantar fibroma nodule.
- This means keeping you active while keeping stress off of your plantar fascia tendon. This will prevent future re-injury and the development of plantar fasciitis.
- If you can get rid of the pain and swelling, this will let you start walking normally.
- If you can walk normally, the vast majority of your pain should gradually start to go away.
- The best way to ensure that your plantar fascia, foot, and ankle ligaments are not overworked is to support them.
- The best way to support them is to use great orthotics and great shoes.
- Some people may also need to rely on supportive ankle braces and other supportive modalities.
Best Shoes for Plantar Fibroma Pain:
- Getting a great supportive pair of plantar fibroma shoes will ensure that there is pressure removed from the heel and plantar fascia region.
- This is especially important if you have plantar fasciitis, heel spur pain, or Achilles tendonitis as well.
- Consider plantar fibroma shoes combined with a good supportive orthotic for best pain relief!
- The following link will show you what our favorites are.
Best Plantar Fibroma Insoles:
- These are our recommended orthotics for plantar fibroma pain.
- Custom orthotics can work very well, but they should not be the first line of treatment due to the cost.
- There are different types of different shoes.
- Women’s shoes usually need a less bulky orthotic but allow for less correction.
- A full-length orthotic requires a running shoe, boot, or comfortable walking/dress shoe.
- We recommend doing everything you can to get a good supportive shoe that can fit a full-length orthotic.
- A further home remedy tip for plantar fibroma pain is cutting out a hole where the nodule uses scissors or a knife. Be careful and start with a very low-cost orthotic.
Click this link for the best podiatrist recommended orthotics!
Best Full-Length Plantar Fibroma Orthotics:
- These will only work in wider shoes or a good supportive running shoe.
- This will not work in sandals, flats, or most women’s dress shoes.








Best Dress Shoe Plantar Fibroma Orthotics:
- These are a great choice for dress orthotics.






Best 3/4 Length Plantar Fibroma Orthotics:
- These are great options for women’s dress shoes and thinner shoes.
- These are not the most supportive pair of orthotics.


Get A Great Dynamic Stretch:
- It is possible to stretch on your own, but these products can also really help!
- This will take pressure off of the ball of your foot.
- This is a form of plantar fibromatosis physical therapy that breaks up the scar tissue.
- We personally prefer this method of stretching.








Get A Great Static Stretch:
- These devices are great for stretching while you are resting.
- This is an excellent plantar fibroma physical therapy routine that you can do at home.
- This will also help take pressure off of the ball of your foot.
- This works great for plantar fasciitis.
- The night splint can be used while watching TV or at night time.






Best Heel Compression Brace:
- A good compression brace can stabilize your foot from turning outward.
- This prevents your foot from pronation.
- The pronated foot will turn your foot outward, in your foot will rub on the outside of the shoe.
- This has solved their pain for many of her patients and is very comfortable to wear inside your shoe.
- This solves both pain and outward pronation for a relatively low cost.




Best Heel Stability Brace:
- The stability brace goes a little bit further than the compression brace to stop your foot from turning out.
- This takes the pressure off of your heel and plantar fascia.
- At the same time, this is a little bit bulkier and does not affect every shoe.
- We find people are a little bit happier trying the compression brace before the stability brace.






Severe Plantar Fibroma Pain:
- If you think you might have a broken heel, a calcaneal stress fracture, or something of similar severity, these products might help!
- Always remember to see a foot and ankle specialist like a podiatrist if you have plantar fasciitis or more severe pain!
Plantar Fascia Tear, Broken Heel Bone, Achilles Tendon Tear:
- If you have a traumatic injury such as a torn plantar fascia ligament, calcaneus stress fracture, heel fracture, or insertional Achilles tendon injury: consider protecting your foot!
- The best way to do this is, of course, to see your podiatrist and get evaluated with an x-ray, ultrasound, and potentially even an MRI or CT scan.
- If you cannot do so, it may benefit you to be in a cast, fractured boot, or even keep the weight off of it with a rolling knee scooter or other protective devices.
- We as podiatrists frequently take patients off work for a very long period of time when they suffer a traumatic injury. Unfortunately, there is no other way around us in labor jobs.
- If you have a sit-down job, there are ways to get people back to work quicker, but this can be impossible otherwise.
Heel Injury Boot Treatment:
- There are pros and cons to using a boot to treat your heel injury. The Pros are that your injured heel will hopefully have a chance to heal gradually! If you are immobilized too long, the cons are that you will gradually become stiff and overworked to your other leg.
- Our favorite fracture boots and their supplies:








Offloading and Scooter treatment:
- These are favorite knee scooters and walking devices.
- If your plantar fibroma pain is severe, offloading can be very effective until the pain calms down.








Best Shoes for a Plantar Fibroma:
Click this link to go over the best shoes for a plantar fibroma!
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FAQs About Hard, Painful Knots on the Bottom of the Foot
These are the most frequently asked painful knots on the bottom of the foot questions:
Plantar fibroma is one of the most common causes and involves a firm, painful lump in the arch of the foot.
Not always, but it’s best to have it evaluated by a podiatrist to rule out underlying issues or prevent complications.
Some cysts or lumps may shrink with rest and support, but most require treatment or monitoring.
It’s benign (non-cancerous), but it can cause significant pain and mobility issues if left untreated.
A podiatrist may use physical exams, ultrasound, or MRI to confirm the diagnosis.
Yes—custom orthotics, physical therapy, corticosteroid injections, and shoe modifications may help.
It can contribute to pressure-related conditions, especially in people with flat feet or plantar fasciitis.
Yes—especially if the lump is painful, growing, or interfering with daily activities.