Sweat duct tumors are adenomas of the small sweat ducts within the epidermis and are benign tumors of the sweat glands that differentiate towards the terminal sweat ducts. Some patients have a family history of sweat duct tumors, which occur on the eyelids and cheeks and rarely resolve on their own, but do not become malignant. The initial stage of sweat duct tumors is usually without obvious conscious symptoms and may form flat yellowish or tawny papules on the skin surface, mostly spherical or flat, 1-3 mm in diameter, mostly dense and non-fusing. They are often symmetrically distributed on the lower eyelids, but can also be found on the forehead, cheeks and pubic area. Some rare subtypes of sweat duct tumors may also be associated with diabetes and baldness.