Atypical melanocytic hyperplasia is when there is proliferation of melanocytes that show nuclear atypicality or scattered single cells high in the epidermis. This may also be interpreted by some pathologists as malignant melanoma in situ. In this case, this melanoma is limited to the outermost layer of the skin or the epidermis. In cases such as this, an evaluation of a dermatologist is highly recommended for proper management. A simple surgical removal produces virtually a complete cure rate. However, if left untreated, the melanoma grows deeper in the skin and is more likely to produce a life-threatening situation. This link may be helpful: http://www.aad.org/public/publications/pamphlets/sun_malignant.html
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