Bumps on the chin may be caused by acne or folliculitis, atopic dermatitis, enlarged lymph nodes and other factors. 1. Acne or folliculitis: Prolonged exposure to high temperature, excessive sweating, scratching, poor hygiene, bacterial invasion of hair follicles and other factors lead to excessive secretion of sebaceous glands, keratinization of sebaceous gland ducts, and collection of secretion in the local area, which triggers acne or folliculitis, resulting in chin bumps. 2. Allergic dermatitis: allergic inflammation in the chin area can lead to localized itching of the skin, which can be manifested as bumps after scratching or secondary bacterial infection. 3. Enlarged lymph nodes: Inflammatory lesions in the mouth, nose or near the ears can lead to enlarged lymph nodes in the jaw area, which can also be manifested as subcutaneous nodules in the jaw, resulting in the phenomenon of chin bumps. There may be other causes of chin bumps, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, and follow the doctor’s instructions to standardize the treatment.