The main causes of hard bumps at the base of the ear are related to local sebaceous cysts, boils in the ear, tumor growths or enlarged lymph nodes, etc. Treatment options usually need to be chosen according to the cause. 1. Localized sebaceous cysts: Sebaceous cysts at the base of the ear usually form hard bumps at the base of the ear, which are related to the blockage of sebaceous glands caused by the increase of local oil secretion. 2. Ear boils: If the skin in the ear root area is infected by germs, such as Staphylococcus aureus infection, boils will easily be formed, which will result in the manifestation of hard bumps at the ear root, and even accompanied by local pain and pus. 3. Tumor growth: If there is tumor growth in the area of the ear root, such as dermatofibroma or subcutaneous lipoma, etc., it is easy to produce the symptom of hard lumps at the ear root, and may continue to grow. 4. Enlarged lymph nodes: If there are enlarged lymph nodes in the ear root, it is easy to produce a hard lump in the ear root, and even accompanied by local skin fever and pain. Pay attention to keep the local skin hygiene and clean, do not smoke and drink alcohol during the treatment process, otherwise it is easy to affect the therapeutic effect. If you have a hard lump inside your ear, you should go to the hospital in time to have the doctor determine the cause of the disease and treat the symptoms.