Well circumscribed tumor, consisting of one or more tumorous nodes, solid, cystic, tubular.

Solid areas contain several kinds of cells: pale (or sometimes clear) cells and dark (with eosinophilic cytoplasm), sometimes squamoid and mucinous cells are present as well. Cystic areas usually contain eosinophilic amorphous material. The lining is flat. Tubules are lined by cubic or cylindric epithelium.

Mitotic activity is present even in benign tumors, the diagnostic criteria of malignity are cellular polymorphism and invasive growth.

Clear cell hidradenoma consists of pale or clear cells.