The anus is moist and there is frequent stool around the anus. This condition is most often considered to be an anal fistula. A fistula is generally a channel between the rectum and the perianal skin, and stool or intestinal fluid is discharged outside the body with this channel, causing perianal dampness, itching, or fecal matter around the anus. You can take a picture of the perianal area with your cell phone and you will find a fistula around the anal opening, which will intermittently cause pain, or pus, or fecal matter. The most important thing is to have a good understanding of the situation. It is also popular to have a trans-sphincter fistula ligation, which is effective. It is generally not advisable to delay for too long because simple anal fistulas can easily develop into complex ones.