I had very big stool that felt like cut. when i looked in the bowel noticed fresh blood on last stool and then blood on toilet paper. when i checked anus had something external from anus and little blood on it. should i take stool tests?

You may be suffering from a hemorrhoid. Confirmation at your doctor’s office if the pain & bleeding continues is recommended. Stool testing is unlikely to be helpful.

Avoiding constipation and an exam in case symptoms persist would help in clarifying your condition.

You likely have external hemorrhoids and could try over the counter remedies for hemorrhoids. To avoid constipation - You may take a fiber laxative like Metamucil and drink enough water daily so that your urine is colorless. For the long term you may try to increase your intake of fiber foods. http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-2