Merck Manual

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Acral-Lentiginous Melanoma
Acral-Lentiginous Melanoma

    This image shows longitudinal pigmentation of the nail (melanonychia striata; blue arrow) and hyperpigmentation extending across the lunula to the proximal nail fold (Hutchinson sign; red arrow) of the middle finger with rounded pigmented lesion of the thumbnail. Acral-lentiginous melanoma, the most common type of melanoma among people with darkly pigmented skin, occurs on palmar, plantar, or subungual skin. This patient was diagnosed with acral-lentiginous melanoma (a form of malignant melanoma).

Image courtesy of Carl Washington, MD and Mona Saraiya, MD, MPH, via the Public Health Image Library of the Centers for Disease Control and Prevention.

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