Hidradenitis suppurativa is rarely symptomatic until infection occurs in the sinus tract. Typical cases are tiny pits in the caudal midline but without any sensation. The pits have tiny holes, some of which are difficult to access with a lacrimal probe. So, how to prevent and treat patients who present with tiny pits in the caudal midline without any sensation? Here is a brief introduction: 1, pay attention to rest, combine work and rest, live an orderly life, and maintain an optimistic, positive and upward attitude towards life is very helpful in preventing the disease. 2, the treatment is very simple, that is, under local anesthesia cross incision and drainage, the incision is selected in the most obvious fluctuation or pressure pain to avoid the midline. Antibiotics cannot replace surgical drainage. For abscesses with cellulitis, or patients with diabetic vascular heart disease or immunodeficiency, etc., antibiotic treatment can be added. After surgery, often check whether the wound is healing health search, shave the surrounding hair, with a probe to gently explore the sinus cavity, or there may be a tuft of hair pulled out, this tuft of hair as a foreign body and perpetuate the infection After the above treatment, some patients may be a period of healing of the wound, but most of them are still not healed after 1 to 2 months, chronic recurrent, which will require radical surgical treatment of the hidden sinus hair.