How can i treat a painful cut inside of my bottom?

How far inside?: It matters how far inside your bottom you are talking about. Most times the blood flow to the pelvic area is good, and wounds or cuts should heal within a week. It matters why the cut is there. Are you referring to an anal fissure? You need to know what it happened. Often you will be told to soak your bottom in a tub of warm water to help clean the area and promote blood flow for healing.