Hard lumps in earlobes may be caused by sebaceous cysts, skin boils, lipomas and other factors. 1. Sebaceous cysts: When patients suffer from sebaceous cysts, it will easily lead to the blockage of sebaceous gland excretory ducts, causing the secretion to be unable to be discharged, resulting in hard bumps in the earlobe. 2. Skin boils: If the patient has skin boils, it may be caused by bacterial infection, which will lead to hard lumps in earlobes and obvious pain, accompanied by fever, headache and other symptoms. 3. Lipoma: Lipoma is a tumor formed by normal fat-like tissue and can occur in various parts of the body. When lipoma occurs in the earlobe area, it may lead to the phenomenon of hard lumps in the earlobe. When a patient develops a hard lump in the earlobe, he or she should go to the hospital immediately to clarify the cause of the problem and follow the doctor’s instructions for treatment.