The possible clinical causes of a swelling on the earlobe include sebaceous cysts and keloids. 1. Sebaceous cysts: This disease refers to retention cysts formed by the gradual accumulation of sebum due to the blockage of sebaceous gland ducts in the skin, and is most common in the head, face, back, buttocks and other parts of the body. The shape is round and moderately hard, the surface is smooth and movable. If secondary infection occurs, there will be redness, swelling, heat and pain. 2. Keloid: This condition refers to pathological scarring caused by abnormal proliferation of connective tissue in the skin, usually associated with skin trauma, postoperative complications and other factors, the clinical manifestation is a swelling above the surface of the skin or a rope, earlobes are mostly formed because of ear piercing. If there is a possibility that the swelling will continue to increase in size or affect the appearance, it is recommended to go to the otolaryngology department of the hospital, and if necessary, surgical removal of the swelling is required.