A bulge under the chin may be a manifestation of jaw abscess, enlarged lymph nodes, folliculitis or boils, etc., which may disappear in a week or so in mild cases, or take two to three weeks or even longer in severe cases, and the exact time of disappearance varies from person to person and from case to case. 1. Jaw abscess: this kind of situation has a bulge under the chin often combined with high fever and chills, if the condition is mild, about a week or so may be able to ulcerate, two or three weeks can be healed, disappeared. However, if the inflammatory reaction is intense, it may lead to the spread of infection and even cause sepsis, which is life-threatening. Antibiotics can be used for anti-infection treatment, such as penicillin, cefixime, metronidazole and other treatments, if it has become pus, you can choose surgery for incision and drainage, and regular medication, usually about a week or so, the wound can be good. 2. Enlarged lymph nodes: Due to the infection of the oral cavity and throat, the lymph nodes in the jaw can be enlarged, resulting in a bulge under the chin. Generally speaking, as the inflammation in the neighboring areas subsides, the swelling of lymph nodes will also subside, which will take about one or two weeks. If the infection is more serious, it may lead to lymph node abscess, which requires incision and drainage, and anti-infection treatment, and will take two to three weeks to heal. 3. Folliculitis or boils: Folliculitis or boils occur in the hair follicles in the jaw area, and a bulge under the chin can also occur. Folliculitis usually heals in a week or so, while boils may take a week or two to heal and disappear. There may also be other reasons for a bulge under the chin, so it is recommended to go to the hospital in time for a complete examination to clarify the cause of the problem, and then give targeted treatment or therapy.