Eccrine poroma is a common adnexal neoplasm that differentiated toward the acrosyringium, the intraepidermal portion of the eccrine sweat duct. This disease appears clinically as skin-colored or brownish nodule, but the lesion can be pigmented when it contains melanocytes and melanin. In that case, it can be very similar to melanoma. Futhermore , eccrine poroma rarely shows squamous differentiation histologically. Nevertheless, it should be differentiaed from basal cell carcinoma and seborrheic keratosis when it shows squamous differentiation. We report a case of pigmented eccrine poroma with squamous differentiation in a 42-year-old male. (Korean J Dermatol 2001;39(10): 1172~1174)