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(A) Melanoma subtypes based on morphology and histology. (B) Melanoma subtypes based on the level of ultraviolet (UV) exposure. (C) Proportion of conventional histologic subtypes in the UV exposure-based classification. SSM: superficial spreading melanoma, LMM: lentigo maligna melanoma, ALM: acral lentiginous melanoma, NM: nodular melanoma, MM: mucosal melanoma, CSD: chronic sun-induced damage, UP: unknown primary.
