Many possibilities: It could be a fungal or bacterial infection. It could be bruising due to tight shoes or trauma. It could be a pigmentation of the underlying skin. It could be a skin disorder or melanoma, or it could be one of a number of many other possibilities. Have your feet checked out by a professional.
Answered 3/13/2019
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A number of possible: It could be dead skin and underlying tissue from a pressure spot or even malignant melanoma. There are too many possibilities to mention them all, but if it has appeared just recently, have it checked and possibly biopsied by a podiatrist. Soon!
Answered 4/5/2018
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