Hi, Along with the eating disorder (I suppose you have been diagnosed by a professional and under treatment for the same), you appear to be suffering from fissure-in-ano. It is probably a complication of the purging and restricting habit. There will be a fissure/ crack in the mucosa/skin of anus. So you are getting blood and pain. This fissure takes time to heal. This will worsen if stools are hard and frequent. So try to maintain a soft stool and try to decrease the frequency of passing stools to once a day. Certain gels like lignocaine can be applied locally to decrease pain, lubricate the outflow and fasten up healing. Though not a reason to worry, it would be advisable to have a consultation with a surgeon/proctologist. Continue consultation with psychiatrist/psychologist and regularise the eating pattern.