A sore next to the anus may be caused by hemorrhoids, boils, and perianal abscesses. 1. Hemorrhoids: If internal hemorrhoids prolapse, a paranal sore can also be formed. Varicose veins in the paranal area can form external hemorrhoids, manifesting as a paranal sore. 2. Boils: If staphylococcus and other bacteria infect the follicular opening next to the anus, it can cause boils at the follicular opening, manifesting as a sore next to the anus. 3. Perianal abscess: If staphylococcus bacteria and other bacteria infect the rectal and anal canal tissues or their surrounding interstitial space, an abscess can be formed, which can be manifested as a sore next to the anus. Once found, it is recommended to go to the hospital in time, to clarify the cause of the disease, under the guidance of a professional doctor to standardize the treatment, to avoid causing delays in the condition.