Dryness around the anus may be caused by improper diet, anal inflammation, hemorrhoids and other reasons. 1. Improper diet: If the patient has a poor diet, often eat stimulating, spicy food, and do not like to drink water, may lead to dry stools, in defecation, dry stools may be on the anus constantly friction, causing dryness around the anus. 2. Anal inflammation: if the patient has anal inflammation and other diseases, the perianal skin mucosa may be stimulated by inflammation or eczema, resulting in dryness around the anus. 3. Hemorrhoids: If the patient has hemorrhoids and mixed hemorrhoids, the hemorrhoids may rub the perianal skin after the patient sits or stands, causing dryness around the anus. If the patient often have dryness around the anus, it is recommended to consult a doctor to understand the condition and intervene as soon as possible.