Typically, when a canker sore grows to the point where an abscess forms, surgery is required. In most cases, the need for surgery for a carbuncle is not based on the size, but on whether an abscess has formed to determine whether to surgically incise and drain it. For simple canker sores that have not formed an abscess before, antibacterial medications such as penicillin or cephalosporins are usually given. If there is localized redness and swelling, topical applications such as ichthyol ointment and erythromycin ointment may be considered. When an abscess is formed, general examination may suggest a fluctuating sensation on palpation, and a liquid dark area can be seen on ultrasound. At this time, it is recommended that timely surgical incision and drainage, so as to avoid the gradual expansion of carbuncle. Carbuncle should pay attention to keep local cleanliness and hygiene, avoid scratching. Usually wear loose, cotton clothes to prevent friction stimulation. It is recommended to consult a doctor in a timely manner, and follow the doctor’s instructions to do the appropriate treatment, so as not to delay the condition.