A pimple at the mouth of the ear eye may be caused by sebaceous cyst of the external auditory canal, folliculitis and papilloma. 1. Sebaceous cyst of the external auditory canal: after the sebaceous gland ducts are blocked, the wall of the external auditory canal can be seen as a hemispherical bulge, and after bacterial infection, there is often localized congestion and tenderness. 2. Folliculitis: folliculitis inflammation can be triggered by infection, stimulation of physical and chemical factors and mechanical injury, which can appear as hard bumps with redness and swelling at the mouth of the external auditory canal. 3. papilloma: skin surface papilloma hyperplasia can be caused by human papilloma virus infection. Patients with a lump at the mouth of the ear eye, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, standardized treatment under the guidance of the doctor.