The symptoms of redness, swelling, itching and pain in the anal area are typical of hemorrhoids, anal eczema and perianal abscess. 1. hemorrhoids, which are caused by difficulties in venous blood flow around the anus, usually result in venous blood clots and lumps around the anus and cause pain and itching. 2. anal eczema should be considered for a variety of reasons. The patient’s anus is a place where the skin is in a humid environment for a long time, which causes the symptoms of eczema around the skin, resulting in pimples and breakouts, leading to redness, swelling, swelling and pain around the anus. 3. Redness, swelling, itching and pain around the anus. In addition to these causes, allergic reactions and viral inflammation can also cause these symptoms.