A small hole in the ear, clinically known as a congenital preauricular fistula, is a congenital condition that is present at birth. It is usually asymptomatic, with white material flowing from the hole and no redness or itching around the hole. Once infected, the surrounding redness and swelling can appear, and even an abscess can appear, which requires antibiotic treatment, such as cefprozil and metronidazole. In addition, the abscess should be treated with anti-inflammatory treatment along with abscess incision and drainage, post-operative drug changes should be strengthened, and the fistula should be removed in time after healing, otherwise it will be easy to recur and the abscess will be cut and drained repeatedly.