Fistula is an abnormal connection between two epithelium-lined organs(like the anal canal
and outside skin in case of anal fistula
) that normally do not connect. It presents as an open hole or a cut near the anus on examination and the patient has the symptoms of external opening, bleeding, swelling or pain. My sincere advice would be to consult a surgeon and getting yourself evaluated for anal fistula.
Hope it helps you. Regards.