Poromas of apocrine lineage probably are more common than eccrine ones. The malignant counterpart of poroma is porocarcinoma, which also shows poroid differentiation. As a benign process, poroma occurs only in the skin and does not affect any other tissues. A poroma usually presents as a solitary papule or nodule.
Most lesions are asymptomatic, but the minor morbid event of pain can accompany some lesions.
Multiple poromas may be of cosmetic concern. Poromas are not known to hold any racial or ethnic predilection. No sex predilection is known in the distribution of poromas. Males and females are equally affected. Poromas typically are asymptomatic, slow-growing, or stable nodular lesions.