Hello. Welcome to hcm
It could be a simple hemorrhoids which are the skin tags
formed when there is constipation
causing straining during passing of stools and blood vessels rupture causing bleeding. It is a benign condition which is cured once stools are made soft. If hemorrhoids are ruled out,then it can a infection or chronic conditions which can only be ruled out by colonoscopy
I advice you to visit surgeon who after examination and investigations will treat accordingly. hemorrhoids need only stool softeners and local anesthetic
creams to be applied over anus. he should drink lot of fluids and fibers in his diet.
Stool examination had to be carried out to rule out infection as he is having discharge also and later treated with antibiotics for seven days.
All the best