Rashes after I have bad bruises

I do roller derby and often have way worse bruises then most of the other girls. They seem to think I need to take vitamins. I also get a red raised rash after each really dark almost black bruise. What are the dangers of this and why would I get these rashes? Also why would I be bruising a lot worse and take the same amount of "beatings" as the other girls? My bruises always end up so dark and big that when I show everyone it usually gets a lot of gasps and eeewws! Help! What would be a reason I could be bruising differently?

[MSKITTY70]

It could be an anemia disorder.  You should go to the Dr and have a physical with some bloodwork done.  That could possibly weed out any blood disorder issues