Cutaneous melanoma Acral lentiginous melanoma 2012-08-01T02:17:02Z SNOMEDCT_US:16974005 UMLS:C0346037 SNOMEDCT_US:254732008 A type of cutaneous melanoma localized to the palm, sole, or beneath the nail (subungual melanoma). Acral lentiginous melanoma starts as a slowly-enlarging flat patch of discolored skin and usually displays a size above 6 mm and often several centimeters or more in diameter upon diagnosis and variable pigmentation with a mixutre of colors including brown, and blue-grey, black and red. The surface of the lesion is initially smooth but later in the course may become thicker and irregular, and may ulcerate or bleed. HP:0012060