I have flat stool all the time since last month.also theres some black/gray spots in stool.i also have 3 bumps in anal canal.doctor did proctoscopy and said hypertrophic anal papile.i also did colonoscopy everything fine.now is it anal cancer?.i m 20?

Unlikely: With the evaluations you had, it is highly unlikely that you have anal cancer. Flat stool is not a medical condition and you should not obsess about it. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Wish you good health!