<unk>  refers to a benign epithelial tumor growing exophytically (outwardly projecting) in finger-like fronds. In this context Papilla refers to the projection created by the tumor, not a tumor on an already existing papilla (such as the nipple.)
Papilloma
Nevus
Condyloma
Carcinoma
Trichoadenoma
Adenoma
Papulosquamous lesions
Mammary adenosis