Ulcerated zosteriform nodules in adenocarcinoma of the colon.

Histiocytoid Sweet's syndrome (HSS) is a rare variant of Sweet's syndrome that typically has similar clinical findings to the classic variant but is diagnosed after histologic review. It is characterized by a dermal infiltrate composed of immature, nonblastic myeloid cells with a histiocytic appearance. In this report, we present a case of a 56-year-old Hispanic man with history of stage IIIB adenocarcinoma of the colon who presented with a case of HSS that mimicked a zosteriform cutaneous metastasis. Several types of cancers can metastasize to the skin, leading to varying cutaneous presentations. In particular, a zosteriform dermatomal distribution of cutaneous metastasis is common in melanoma and has been reported in other cancers, such as colon and breast. To our knowledge, this is the first case in which the clinical presentation of HSS appeared in a zosteriform pattern and distribution.