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A new clinical classification of acral melanoma according to the different onset characteristics. In total, 303 acral melanoma patients were divided into four types according to their different onset characteristics: Type 1, trauma type; Type 2, pigmented nevus type; Type 3, pigmented nevi with trauma; Type 4, pigmented nevi with natural ulceration. (This figure was created with BioRender, https://biorender.com/).
