Depends.: If you are sure that initially it was a mole (i mean in technical language 'melanocytic lesion'), this sudden change in color is highly worrisome and may represent cancer (melanoma). Mole (non-specific word) includes other causes. Need to be checked by dermatologist with biopsy to confirm depending on the evaluation by dermatologist. Some dermatologists specialize in pigmented lesions.
Answered 5/28/2016
5.3k views
Time to see your doc: Changes in the appearance of any mole warrants a trip to your friendly dermatologist.
Answered 7/21/2016
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