Hard bumps inside the earlobe may be caused by scar hyperplasia, sebaceous cysts, and folliculitis. 1. Scar hyperplasia: once through the ear piercing or ear trauma, the formation of connective tissue scar hyperplasia, at first a red rash, gradually harden, touch the earlobe inside a hard lump. 2. Sebaceous cysts: sebaceous glands secrete more exuberantly, sebaceous gland ducts are blocked and secretions are retained to form cysts, which are relatively hard to touch, and most of them are painless. 3. Folliculitis: the hair follicle inside the earlobe is infected by bacteria and triggers inflammation, which will also form hard bumps, accompanied by pain. There may be other reasons why there are hard bumps in the earlobe, so it is recommended that you seek medical attention to identify the cause of the problem and follow the doctor’s instructions, so as not to miss the opportunity to treat your condition.