What could be the cause of a tiny bit of blood and burning when i evacuate ? it's the equivalent of a scattered drop .

Benign: And malignant causes. If you are straining/constipated-then: hemorrhoids. There are other causes. See your doctor to help figure out cause.

Rectal bleed: If you have hemorrhoids, you know it, these are cause for small bleed. Or there is constipation & straining can do that. However if hemorrhoid & constipation are not there and you see blood on each evacuation, then see gastroenterologist for colonoscopy to find out the other causes such as diverticulosis , avm, ischemia, colitis of any type&cancer. Wish you good health.