A previously reported case of malignant melanoma developing in a preexisting intradermal nevus had a fatal termination due to widespread metastatses. We have seen an additional case of possible malignant melanoma developing in a preexisting intradermal nevus. Although malignant transformation of intradermal nevi is rare, it is important to recognize that it may occur.
Okun MR, Di Mattia A, Thompson J, Pearson SH. Malignant Melanoma Developing From Intradermal Nevi. Arch Dermatol. 1974;110(4):599-601. doi:10.1001/archderm.1974.01630100055013