Water in general disrupts clotting, so you're all kinda right and kinda wrong. While warm water may appear to prevent clotting, it's really just causing vasodilation in your face and increasing blood flow to the skins surface, thereby increasing bleeding but not having any direct positive or negative effect on the process of clotting itself. Cold water on the other hand constricts blood flow and decreases bleeding, but the temperature of the water again has no direct effect on the act of clotting because both are actually actively washing away the clotting factors that are required for clot formation.
Applying heat over a blood clot is mostly to help keep the vessel dilated so that tissues beyond the clot don't starve due to lack of perfusion.
My barber applies hot towels after using his straight, so I think I may ask when I see him again if there's any particular reason to use the hot towel after the shave other than the fact that it feels good.
Applying heat over a blood clot is mostly to help keep the vessel dilated so that tissues beyond the clot don't starve due to lack of perfusion.
My barber applies hot towels after using his straight, so I think I may ask when I see him again if there's any particular reason to use the hot towel after the shave other than the fact that it feels good.