Four or five days ago i had a dry bowel movement that tore skin at the anus. it has been bleeding since then. how can i stop it? there are no more details.

You : You can apply a small amount of topical antibiotic ointment with pain medication to the area two to three times a day. This can be bought in any pharmacy over the counter(otc). Also avoid straining with bowel movements, increase your fiber intake, water, and try a stool softener like colace, (docusate sodium) which can also be purchased otc. If the bleeding persists see your doctor.

Fissures: Are tears in the anal canal from spasm in the internal sphincter which arises with constipation or chronic diarrhea. Besides causing pain and bleeding, they can get infected and cause abscesses and/or fistulas. They should be properly diagnosed and treated too avoid complications. Drink more fluids and if the pain and bleeding doesn't stop in 10-14 days see a colon and rectal surgeon.