It may be simple: hyperpigmentation, a relatively benign concentration of the skin pigment melanin. Acanthosis nigracans is hyperpigmentation, often in body folds such as armpit/axilla, possibly inherited and associated with glandular conditions including obesity, diabetes, thyroid disease. Consider seeing a Dermatologist for diagnosis. Prescription strength hydroquinone is available. Carefully review OTC products
Answered 1/17/2021
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