We had a guy that used to roll at our club who had impetigo. It looked exactly like you described: small red bumps.
EDIT - Also, I had some kind of fungal infection on my shin which I started a thread on with pics. It started as an irritated hair follicle, then turned into a sweat pimple, then widened out and broke open. There are pics in the thread "Skin problem".
Fucidin based ointment cleared it up presto fasto, when nothing else would.
EDIT again, here is the thread.
http://www.10thplanetjj.com/threads/11862-Skin-problem