The anus is a little swollen to consider the following several situations: 1, mixed hemorrhoids, most of them are due to poor dietary habits, especially the recent intake of too much spicy, stimulating food, appearing dry stools, defecation difficulties caused by hemorrhoids, local edema, congestion, so that the external hemorrhoids are obviously swollen and protruding. 2, it may be belonging to the annular hemorrhoids, especially hemorrhoids embedded, will be in the formation of the circle around the anus is obvious. 3, may be perianal abscess, the main symptom is edema around the anus when pressing hard to the touch, there is a sense of fluctuation. 3, may be perianal abscess, the main symptom of edema around the anus, when pressed on the hard touch, there is a sense of fluctuation, the need for surgical treatment, mainly surgical incision and drainage. 4, there may be anal eczema, perianal inflammation and other triggers, it is best to carry out the appropriate examination, distinguish the specific causes, and then targeted treatment.