melanoma, acral-lentiginous

melanoma, acral-lentiginous A type of malignant melanoma that is uncommon in white people but the most common type in nonwhite people. Acral-lentiginous melanoma starts as an irregular enlarging black flat spot (macule), most often on the palm of the hand and the sole of the foot, less often on a mucosal surface, such as the vulva or vagina.