Perianal abscess is mainly characterized by redness and swelling of the local perianal skin, rupture, pus discharge and pus from the anus, etc. The appearance of abscess varies slightly depending on the specific location. 1. Superficial perianal abscess, perianal subcutaneous abscess, mainly manifested as redness and swelling of the local skin of perianal area; pus is discharged after rupture. 2. Sciatico-rectal fossa abscess, mainly manifested as huge redness and swelling of the lateral anus, with more pus after rupture. 3. Abscess on the anus lifting muscle, due to the deep location, the local external manifestation is light, but the systemic symptoms may be heavy, occasionally with difficulty in urination; drainage after rupture, and the time for dressing change is mostly longer. 4. Rectal submucosal abscess, often manifested as anal pain, urgency or difficulty in urination, and pus flows out of the anus when the abscess breaks. 5. Inter-sphincter abscess, few external and self-conscious symptoms, pus flows out of the anus when the abscess breaks. In addition to the appearance of perianal abscess, there are pain, fever, high fever and other systemic sensory symptoms, routine blood test can have obvious white blood cell elevation, ultrasonography can be found in the liquid area. Perianal abscess is not difficult to diagnose, but mostly due to the privacy of the site is easy to delay, delay, find uncomfortable symptoms need to consult a doctor in time.