I’m not the best spanker to ask about this particular outcome, as I always try to avoid bruises.

But I can point you towards to the sensible advice of health professionals, and compression with ice seems to be the standard advice for painful bruising. It’s a bit more complicated with the risk of infection if the skin is broken, which is all the more reason to try to avoid that when spanking.

Next time, try incorporating more corner time and bottom inspections into your play, and your partner should be able to stop safely well before you get hurt, without making it any less enjoyable or erotic.