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What is the dark spot on the bottom of foot? What could cause it?

My brother in law noticed a dark spot on the bottom of my foot today when I had my feet propped up. There is one that is a circle and another that is oblong along my heal. The oblong is on the outside of my heal the other circle spot is on the inside of my heal. They re dark purple. I have no pain in my feet. I did run a 10k this morning, but I don t know how long they ve even been there. When I apply pressure to the spots they don t change color. I can t feel anything under the skin. The circle one is pretty consistent in color. The oblong spot has 3 lighter spots toward the middle along the length of the spot. Any ideas on what would cause this? Can you bruise in your feet? It was a trail run with uneven ground.
Asked On : Wed, 19 Sep 2012
Answers:  1 Views:  881
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Question is related to
Diseases and Conditions
Dermatologist 's  Response
Thanks for the query,

There are two possibilities,

1. You might have developed fungal infection,

It is called as tinea nigra.

Your description matches with this.

Please get a KOH mount done,

This can confirm the fungal etiology.

Treatment can be with oral antifungals as well as with topical antifungals.

2. melanoma, which is a cancerous condition,

A biopsy may be needed to differentiate between them.

Please meet a dermatologist for exact diagnosis.

Let me know if you have any other doubt.

you can ask a direct question to me on this forum, following the below link.

Wishing you a good health.
Thank you
Answered: Fri, 6 Sep 2013
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