Black Discoloration "Underneath" Toenail

I noticed a gradual darkening to what is almost a black color beneath a normal looking toenail. I did not injure
my toe in any way, but I do have numbness and a part of the tip of the toe I can't feel any sensation at all. I read that this may be a sign of malignant melanoma, although rare in occurrence. I am concerned because when I was growing up from the age of 16 on, I used to work in a tanning salon and used to spend hours (actually) at a time in the tanning bed. I still tan at the age of 45, but not nearly as frequently. I have also lost a great deal of weight (over 20 pounds) in the last 3 months or so without dieting. Would this increase my chances of getting melanoma although I am naturally dark (Italian heritage)? What tests would you suggest I have to determine if this is melanoma? What are your recommendations?

[Bhupinder Kaur, MD]

Hello,
Such blackish discoloration under the nail can be due to subungual hematoma due to trauma or injury, fungal infection of the nails or in psoriasis nail. If it is a subungual hematoma, then it may need to be drained. I would suggest you to get an examination done from a dermatologist.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.