Fatty grains may be deposits of fat-like substances in the epidermis caused by diseases such as corns, sweat duct tumors, etc. They generally do not cause any discomfort and can be left untreated, but if there is a need for treatment, they can be removed by medication, surgical treatment or laser ablation. 1. Corns: Corns are benign swellings or retention cysts on the skin or skin appendages, often manifested as yellowish-white, firm papules, generally without obvious discomfort, which can be treated by taking medicines such as retinoic acid, or can be treated by laser ablation and electrodesiccation method, generally without surgical treatment. 2. Sweat duct tumor: Sweat duct tumor is a kind of benign swelling that occurs in the ducts of small sweat glands in the epidermis, preferred in young women, often clinically manifested as skin color, light yellow or brownish yellow elevated plaques, mostly pinhead to pea size, part of them can reach 1cm, with the shape of round, oval or irregular, which can be eliminated by electrocoagulation, photoelectric therapy, microwave therapy and other methods. If there is a need for treatment, it is recommended to go to a regular hospital for diagnosis and treatment.