I've recently discovered first-hand the vagaries of internal bleeding: if you injure deep tissue, the blood takes quite a while to work its way to the surface. When I broke my arm, I lost a pint or so of blood but none of it was visible for the first two days and more was emerging for up to a week. That is, presumably, what's happening in your case, too.
The question, I guess, is whether or not the deep-tissue damage is any kind of big deal in your case; maybe it's worth seeing a doctor just to check?
I've recently discovered first-hand the vagaries of internal bleeding: if you injure deep tissue, the blood takes quite a while to work its way to the surface. When I broke my arm, I lost a pint or so of blood but none of it was visible for the first two days and more was emerging for up to a week. That is, presumably, what's happening in your case, too.
The question, I guess, is whether or not the deep-tissue damage is any kind of big deal in your case; maybe it's worth seeing a doctor just to check?