Are small, non-bleeding scratches and wounds that are red like blood, and whitehead or blackhead pimples considered impure, and does their impurity transfer upon contact with wet objects?

Do not pay attention to such matters, lest you open the door to obsessive thoughts for yourself. These scratches, wounds, and pimples, as long as they do not bleed or ooze, do not contaminate what they come into contact with, even if their color differs from the natural color. Furthermore, the impurity of blood is a matter of scholarly disagreement in the first place.