Histologic features of hidradenoma

(A) Hidradenomas can exhibit both eccrine and apocrine differentiation and are characterized by large, nodular collections of keratinocytes with variable duct formation (H&E 40x).
(B) A variety of hidradenomas have been described. The pale/clear cell variant is composed of a preponderance of keratinocytes with abundant pale cytoplasm (H&E 200x).