Malignant melanoma is a tumor arising from melanocytes which originate in the neural crest. According to several reports, about 20-30% of all melanoma are associated with pre-existing nevi. Because early detection and intervention of aquired and congenital nevi is the only way to increase survival, the important risk factors should be carefully observed, especially if there are changes of to the number, size, and characteristic of the nevi. We present a 41 year-old man who has a superficial, spreading type of malignant melanoma, which arose from an acquired nevus following trauma to the right malleolar area. This case is interesting because of the clinical type and accompanying pathologic condition of the benign nevus.
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