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, which will form local inflammatory edema as well as bruising and swelling, there will be obvious 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 inflammation and swelling of lymph nodes in the relevant areas. Third, due to the injury of the skin, subcutaneous tissue, muscle, ligament or bone in the chin area, resulting in the rupture of small blood vessels and leakage of blood, bruising, swelling, inflammatory edema will be formed locally, and a feeling of swelling and pain will appear.