Darkened skin in the armpit of a patient in a case of acanthosis nigricans. This condition is a form of hyperpigmentation of the skin, usually in the armpits and other body folds. It is a sign of an underlying disease, most commonly obesity or diabetes. Rarely it is a sign of an internal malignancy (cancer). Treatment is of the underlying condition.

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Photo credit: © RICHARD USATINE MD / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: abnormal, acanthosis, armpit, axilla, body, clinical, condition, dermatological, dermatology, disease, disorder, healthcare, human, hyperpigmentation, insulin, medical, medicine, nigricans, patient, person, pigmentation, resistance, skin, unhealthy