Re: Strep Uticaria?
FWIW, I have a friend whose 3-year old son had a fever and mysterious rash that turned out to be due to a strep infection. My friend lives in another state so I didn't see it for myself, but it seems that the connection between hives/rash and strep is not completely uncommon.
I can't provide anything useful about the bruising though, sorry. Have you thought about taking your son to a dermatologist? Or are they fading now?