Mole Under the Toenail or Fingernail

A Mole Under the Toenail or Fingernaill can be dangerous if you have it, but it usually is not really a mole. Make sure that you don’t have one of 4 different causes:

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1)Runner’s toe– 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 the form of leakage or blistering under the nail. This page is dedicated to treating runner’s toe.

2)Pseudomonas bacterial infection– If your nails have green or black little spots on them. This can occur if you are around moisture. **Smell your toes to see if they give off a Sweet grape-like odor- Seriously!**. The treatment for this is to go see your podiatrist for medication.

3)Toenail fungus– If your nails gradually become thick, discolored and crumbly under the border then read our comprehensive guide to toenail fungus.

4)Melanoma– If you have an unusual streak of black pigment that is pain free and just appeared over a without any incident- it is essential that you read our guide to black streaks in your nail.

Complete Guide to Black Streaks in the Nail


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 that is forming under the nail plate.
  • If you have ever considered that there may be a wart underneath your nail that is just not healing.

For More Resources: .


Mole Under the Toenail or Fingernail

Complete Guide to Black Streaks in the Nail


About the author

The Modern Podiatrist (Foot and Ankle Specialist Doctor):Today's podiatrist is required to undergo rigorous medical training that licenses them as physicians with equivalent legal standing to the MD and DO degree (These are physician recognized licenses most common only in the USA). Although admittedly the training does differ between the three degrees. The differences are listed below.In Michigan Podiatrists are trained and authorized to perform surgery in the foot and ankle up to the tibial tubercle below the knee.All our podiatrists and foot doctors have undergone rigorous training including a 4 undergraduate college degree, writing the medical school entrance exam (MCAT), followed by a 4 year medical school degree (DPM - Doctor of Podiatric Medicine),Once podiatrists in the USA complete the rigorous 4 year medical school courses, they are required to complete a minimum of 3 years of a surgical and non-surgical residency program. Some podiatrists and foot doctors then choose to go on to further fellowship training specializing in various forms of specialty such as diabetic surgery or reconstructive foot and ankle surgery.The training is not over yet! Each podiatrist must be judged by a governing body where they submit their surgical cases and are reviewed regularly to ensure excellent results. This is a career long evaluation with board qualifications and certifications every few years.So have faith that today's podiatrist is your best choice for your foot and ankle problems! We are able to approach you foot and ankle problems from a non-surgery perspective, but that when necessary we can provide you with the treatment that you need!All articles written by this account are considered to be for educational purposes only. It is impossible for us to truly assess your condition and the advice we give here is meant to give you a basis to then follow up with your podiatrist and foot doctor later.If you have any questions at all, or there is anything that we can help you with, please feel free to contact our office or email us. Podiatrists provide medically necessary treatment which should be covered by valid insurance plans, we are not a cosmetic or elective medical specialty.