Acquired dermal smooth muscle hamartoma:
a unique presentation simulating Becker’s nevus


KEY WORDS: Acquired smooth muscle hamartoma, Becker’s nevus, hypertrichosis, hyperpigmentation

We report a 24-year-old woman who presented with a slightly hyperpigmented plaque on the left shoulder, which appeared during adolescence. The lesion was unusual in that it was composed of densely grouped papules without hypertrichosis. Histopathologic examination revealed smooth muscle bundles in the dermis, consistent with a smooth muscle hamartoma. These lesions share many clinical and histopathologic features with Becker’s nevi and therefore have been considered part of a spectrum. We consider our case to be a unique presentation of an acquired smooth muscle hamartoma as supported by a review of the literature.

[download id=”256″ format=”3″]