http://www.youtube.com/watch?v=2N3dI-j6enA
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Get to the Dr so they can test it for Mrsa. I've had reg staph once and Mrsa. Shit spread like crazy bc bacteria lives in colo nies and is resilient as hell. Most likely you'll be given antibiotics but if you test positive for Mrsa the Dr gives you an ointment to spread in your nose.
During the summer I would get small red bumps on my wrist, thankfully it was just heat rash.
http://images.agoramedia.com/dailygl.../heat-rash.jpg
Most online pictures of heat rash are extreme. This is probably the most mild one I found that was similar to the one on my wrist. It wasn't contagious but could potentially expose me to an actual infection. Needless to say, I always rolled with a rash guard until it cleared up while I kept applying trible antiobotic ointment to it, in order to prevent any infection.
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