Skin Lesion: The differential diagnosis is very broad for a pigmented lesion (rarely, vascular lesions can appear pigmented as can some acute processes like infection or arthropod assault (bites)). Without more history about timing, etc., little can be said with certainty. Briefly: for an old melanocytic nevus (mole) that is changing doctors worry about malignant transformation (melanoma) and would biopsy it.
Answered 6/13/2016
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