Midline eccrine nevus.

Eccrine nevus is a rare benign solitary lesion with increased size and number of eccrine coils, ductal wall thickening, and luminal dilation, in the absence of collagen or fibroblast overgrowth. We present a 3-month-old male with a mid-line nuchal scalp lesion shaped like Mickey Mouse's head since birth that yielded a biopsy proven diagnosis of an eccrine nevus.