Eruptive poromatosis in a patient with breast cancer.

Poromas are a group of benign growths of poroid differentiation derived from cells of the terminal sweat duct and connected to the epidermis, normally presenting as solitary papules, plaques or nodules. Rarely they can be eruptive in nature and as such are described as poromatosis. We report an unusual case of widespread poromatosis occurring in a woman with metastatic breast cancer who had recently completed chemo-radiotherapy.