Why does anus always swell after hemorrhoid operation?

Hello, considering perianal inflammation according to your description, you can take levofloxacin hydrochloride capsules orally, levofloxacin is recommended for drug treatment, and potassium permanganate solution is often used for hot water sitz bath treatment. Be sure not to apply hot compress, because hot compress will dilate and congest the capillaries, but it will aggravate the pain.

Guiding opinions:

Diet should be thick and thin, and drink less strong tea, coffee, wine and spicy food to reduce the stimulation to anal canal. Keep the stool unobstructed, take a warm bath after defecation, eat less light food, eat less spicy food, fry and fry, and eat more fruits and fibrous food, especially bananas and honey. Regularly defecate every day and take a bath after defecation.