My rectum began to itch then bleed when defecate. and skin growth at top and bottom of anus opening?

Hemorrhoids?: Was your stool hard? Is this the first time? What's your age? Do you stand on your feet for a prolonged time? Do you have anal intercourse? All these points are pertinent to your question, and should be reviewed by you and your doctor.

Rectal problems: You need to get a proper exam from your physician and determine the best treatment.