A hard lump growing at the root of the earlobe may be caused by sebaceous cyst of the earlobe, folliculitis or enlarged lymph nodes. 1. Sebaceous cyst of the earlobe: It is mainly due to the blockage of the sebaceous gland’s excretory ducts, the secretion can not be discharged efficiently, which leads to the situation of hard lumps growing at the root of the earlobe. 2. Folliculitis: a hard lump at the root of the earlobe may be caused by folliculitis, which may be caused by bacterial infection, and red pimples will appear centered on the hair follicle, and there will be a certain degree of pain and itchiness when touched. 3. swollen lymph nodes: the earlobe is the most dense distribution of lymph, if there is inflammation elsewhere, it will cause lymphatic inflammation of the swelling symptoms, thus appearing at the root of the earlobe long hard lumps. There are many reasons for a hard lump at the root of the earlobe, and patients should go to the hospital in time to clarify the cause of the disease under the guidance of the doctor’s reasonable treatment.