I have little wound on upper anus. it is itchy sometimes. there have been a month since i got this wound. what should i do?

Anal fissure: It sounds like an anal fissure. Fiber can help keep stools easy to pass. Moist towelettes instead of dry toilet tissue can help prevent irritation and enhance healing.

Anal fissure: You are describing a tear in the lining of the anus, called a fissure. This is usually because of hard stools, straining, and constipation. Use something like preparation H or hydrocortisone on the area, use a mild laxative or stool softener. Also helps the fill a bathtub with warm water and sitting in it a couple times a day. If this persists or worsens surgery might be needed.