Blood on toilet paper after passing stool. no pain but feels tender/cut. tiny yellowish flakes (like dandruff) around anus. what can that be?

Anal fissure/piles: Your symptoms are consistent with anal fissure and/or piles. You should see a doctor as blood loss can lead to anemia. To keep you stool soft, take a fiber laxative like Metamucil, drink enough water daily so that your urine is colorless. Try to increase your intake of fiber foods. http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-20050948