Potassium permanganate has a disinfectant and antibacterial effect, which can prevent infection, but not prevent the proliferation of granulation tissue after hemorrhoid surgery, which is usually a manifestation of the recovery of the proliferation of skin tissue after injury. Potassium permanganate is a strong oxidizing agent with bactericidal and disinfectant effects, and can be used in sitz baths to disinfect and promote local blood circulation in the wounds and promote wound recovery. And the recovery of larger wounds will appear the case of granulation tissue. So the use of potassium permanganate after hemorrhoid surgery can not prevent granulation tissue. It is recommended to use 1:5000 potassium permanganate fumigation sitz bath as prescribed by the doctor after surgery.