The clinical features of abscess perifolliculitis are abscesses formed when most aggregated folliculitis and perifolliculitis fuse deeply and penetrate each other. Whether this disease is directly related to cellular infection is controversial, and it is speculated that it may be an autoimmune reaction. Clinical features 1. The disease occurs in adult males; it begins on the head, especially at the back of the head. The lesions initially occur as several folliculitis and perifolliculitis, with inflammation progressing deeper to form hemispheric nodules, which soften and form pustules that break down into numerous fistulae with pus flowing out; the fistulae communicate with each other, and pressure on the nodules can drain pus in the fistulae that are close together or farther away. 3, the chronic process, recurrent, often a lesion, so extended years to more than ten years. Diagnostic points occur in the head, especially in the parietal and occipital areas. The damage starts as follicular and perifollicular inflammation, and gradually increases to form hemispherical nodules, nodules, which soften to form abscesses, and then break down to become most fistulas, with pus flowing out. The abscesses communicate with each other in a “sieve-like overflow of pus”. Often, one area heals and scars, and new lesions appear elsewhere. There may be interconnected sinus tracts between the scars. Hair loss in the lesions is irreversible.