Sclerotic fibromas of the skin.

We report a case of a 34-year-old Japanese woman with a fibrous tumor on the left palm that fulfilled the criteria of sclerotic fibroma of the skin. Immunohistochemically, the tumor cells were positive for vimentin, but negative for S-100 protein and neuron-specific enolase. Ultrastructurally, the cross-striations of collagen microfibrils were less prominent. Our case supports the concept that sclerotic fibroma of the skin is a distinctive lesion which may represent a hamartoma of the skin.