Swelling and pain in the chin is mainly due to three reasons: First, due to skin problems in the chin area, such as folliculitis and sebaceous cysts, which may cause local inflammatory lesions that can form local inflammatory edema as well as bruising and swelling, there will be significant swelling and pain. Second, the swelling of lymph nodes in the chin area is mainly due to inflammatory lesions in the face, mouth, and head, which can lead to inflammatory accumulation in the relevant lymph node areas and swollen and painful lymph nodes. Third, due to damage to the skin, subcutaneous tissue, muscles, ligaments or bones in the chin area, which leads to the rupture of small blood vessels and leakage of blood, bruising, swelling, inflammatory edema will be formed locally, and swelling and pain will occur.