A bulge in the chin that hurts when you touch it may be related to sebaceous cysts, boils, acute lymphadenitis, and so on. 1. Sebaceous cysts: The contents of sebaceous glands cannot be discharged due to blockage of the ducts, and a bulge is formed when the contents accumulate in the ducts. 2. Boils: Inflammation caused by bacterial attack on the hair follicles in the jawline of the chin, which can form hard lumps that hurt when touched. 3. Acute lymphadenitis: Inflammation near the chin and jaw can cause swollen and painful lymph nodes. There are other reasons why it hurts when you touch it, so we suggest that you go to the hospital in time to get a clear picture of the cause of the disease and standardize your treatment under the guidance of your doctor, so as not to delay the disease and bring adverse effects to your body.