We all know that if one bleeds externally, it nullifies your prayers. Now I wonder what if one has internal bleeding from physical activities or bleeding gums from brushing teeth or a tongue bitten or the inside of your mouth bleeds. Would your prayers be accepted then?
it all depends on the "niyyat" (intention)....
dont worry a lot about such things....
if u see something clearly, wash it, put a bandage or something, otherwise be relaxed, no harm to prayers done....