The redness and purple itchiness of the anal opening and the inside may be related to hemorrhoids, perianal abscess, anal eczema and so on. 1. Hemorrhoids: mainly due to the anal cushion downward, varicose veins and other causes, poor eating habits, defecation habits can also trigger the disease, often showing perianal itching, pain, prolapse, bleeding, etc., which may lead to the emergence of the anal opening and the inside of the red and purple itchy situation. 2. Perianal abscess: mainly due to infection, trauma, tuberculosis, tumors, etc., often showing perianal pain, swelling, accompanied by fever, fatigue, etc., may lead to the emergence of the anal opening and the inside of the reddish-purple itchy situation. 3. Anal eczema: mainly due to trauma, friction, anorectal disease secretion stimulation, allergies, heredity, etc., often showing erythema, pimples, itching, etc., may lead to the emergence of the anal opening and the inside of the reddish-purple itchy situation. Itchy redness and purple inside the anal opening and more reasons, should be timely to the hospital examination, clear causes, give targeted treatment, to avoid aggravation of the condition.