The initial stage of anal fistula has the manifestation of perianal abscess, redness, swelling, heat and pain around the anus, swelling and pain around the anus, or there is localized redness and swelling, redness and pain is unbearable, the swelling may break down and flow pus by itself. You can use ointment of poison extraction type, such as ichthyolite ointment often applied, which will accumulate pus and extract poison out. The outer opening at this time is the same as the ulceration after the skin breaks down, a very small break, which will become hard and tough as time goes on. In the early stage of anal fistula, the external opening is like a mucous membrane break in the skin, a very shallow mouth, and after 5-7 days the external opening is likely to close on its own.