L.S.
This is called an anal fissure (pretty sure). I had one at the end of both pregnancies and can definitely be caused by straining (constipation) hard bowel movements, etc. First thing, drink lots of water and eat lots of fiber. You also need a stool softener. Fiber one cereal is really good for bowel movements, Colace, and Benefiber. Every time you strain you can rupture or tear the area again and it make take a few weeks to heal. Don't be too alarmed. If it doesn't stop bleeding you may need to have someone look at it, but if it does stop then you are probably fine. You may also want to have someone take a look at it as well just to make sure it is an anal fissure. Let me know if you have any questions.