Only after a bowel movement my rectum/anus is painful with a burning sensation that does not subside with using any ointments, it actually intensifies the burning. The burning lasts from bowel movement till the next morning when the alarm goes off. There are no bumps present, so what could it be?
drink alot of water
you could have an anal fissure. see your dr. i had one, and my dr gave me suppositories, and it healed after about 10 days.
http://www.mayoclinic.com/health/anal-fissure/DS00762/DSECTION=3
You probably have a hemorrhoid. Increase your fiber intake. If you see any bleeding, go see a doctor.
could be internal hemorrhoids, fissures (tears) or you are eating too spicy or harsh foods or too much acid.
You might need a stool softner or maybe you need to drink more water. It sounds like you bm's might be so hard they are irritating your rectum.