If there are no uncomfortable symptoms, it is considered that the lower edge of the tip of the tailbone is hollow, and the soft tissue around the anus is a normal structure of the human body, which usually needs to be protected from damage. If there is a depression in the skin to form a sinus tract while there is a discharge, consider the performance of perianal hidden hair sinus, consider local obesity, intergluteal fissure is too deep, long time sedentary people are prone to appear, need timely surgery after diagnosis. After the rupture of perianal abscess can appear depressed cavity, accompanied by local redness, swelling, pain, squeeze can have discharge, need to take oral medication or active symptomatic treatment, suggest to regular hospital to check the specific situation.