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 3/26/2019
4.4k views
I don't know.: These lesions need to be visualized & a history needs to be obtained in order to make an accurate diagnosis.
Answered 10/25/2017
501 views
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