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554 Skin

A 50 year old man develops a mass on the back of his hand. The lesion somewhat resembles a “volcano” and consists of a round, firm, flesh colored, 1-cm nodule with sharply rising edges and a central crater. Keratotic debris can be expressed from the central crater. The lesion has developed very rapidly over about a three month period. Which of the following is the most likely diagnosis?

AKeratoacanthoma
BLipoma
CMalignant melanoma
DPyogenic granuloma
Skin
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