I am 22 yrs old, i experienced this bleeding during my bowel movement for about a week now. I could consider it ample amount because it would really discolor the the contents of the bowl. I was wondering if this was due to my irregular diet. The day before i started to bleed I haven't taken any food to eat for about 16 hours because i was very busy finishing up my work. I could also observe that there's a little muscle on swell on my anus. What could be the possible cause of this one?