The Tibetan hair sinus, also known as the dermatomal sinus, is a malformed development that can occur anywhere between the occipital and sacrococcygeal regions, with the sacrococcygeal region being the most common, and can be associated with spina bifida and spina bifida. It is less common clinically, more common in males than females, and occurs mostly in late adolescence after 20-30 years of age. The disease is characterized by anal swelling, pain, and perianal pus flow, with associated infection seen as chills, fever, and peripheral discomfort. The fistula is often surrounded by abnormally long hairs, hyperpigmentation or capillary-like changes, and in some cases there are lipomas protruding above it. Where the sinus tract passes, there may be defects of the skull, dura mater, sphenoid, vertebral plate, and dura mater in the corresponding areas. In the absence of infection, it is easily overlooked. Treatment principles: elective resection in uninfected cases, surgery in infected cases after infection control.