The specific causes of anal redness include the following: first, inflammation: the most common in the clinic is the inflammation around the anus and the inflammation of the rectum and anal canal, which often manifests itself as local inflammatory reactions such as redness, swelling, heat and pain, especially when defecating or constipation, and the pain will gradually increase. Second, eczema: due to the occurrence of eczema in the anus, the anal area is relatively dirty, defecation long-term, repeated stimulation may lead to the occurrence of dampness, causing eczema, red patches of exudation or exudate, these may lead to local redness. The third, other: not excepted is due to hemorrhoid nucleus prolapse, internal hemorrhoids hemorrhoids caused. In short, the anal reddening causes are more and more complicated. You should go to the hospital in time to find the cause of this situation.