Few pigmented sweat gland tumors have been reported in the dermatologic literature. A case of pigmented eccrine acrospiroma is reported herein. The pigment found in the lesion was melanin, present in melanocytes proliferating in epithelial portions of the tumor and in melaninladen macrophages.
Report of a Case
A 27-year-old black woman noticed an asymptomatic, slowly enlarging, dark nodule on the lateral aspect of her right forearm two months before her initial visit. The results of her general physical examination were unremarkable. The lesion was a 2 × 2-cm, soft, pigmented, smooth-surfaced, nonfluctuant, nontender, superficial nodule fixed in the skin. It was subsequently surgically excised.The epidermis appeared normal. The dermis showed wellcircumscribed, multilobulated, epithelial cell masses surrounded by thin fibrous bands. The tumor extended to the subcutaneous tissue (Fig 1). The lobulated masses showed elongated, tubular lumina lined by cuboid cells with round nuclei and considerable amounts of eosinophilic cytoplasm.
Fathizadeh A, Miller-Catchpole R, Medenica MM, Lorincz AL. Pigmented Eccrine AcrospiromaReport of a Case. Arch Dermatol. 1981;117(9):599-600. doi:10.1001/archderm.1981.01650090081037