25 y/o active nonsmoker. good diet, low cholesterol (121). c-scope yesterday 4 bloody d, pain, low protein. no ibd, but 3mm sessile polyp removed 4 biopsy. polyps normal at 25? any other tests needed?

Not normal: You need to have colonoscopy repeated for surveillance - every 5 to 10 years depending on what your doc advises.

Yes: There is something very wrong going on. If you were my patient, i would order a cdsa, and bloodwork for micronutrients. I may also consider some genetic testing. Your cholesterol actually seems a little too low. Cholesterol is actually needed by the body to make many important hormones.