Red, blotchy and pimply after a workout or shower

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Hiya,

Does anyone else get this? After I get out of the shower, my forehead is often red and has what looks like tiny pimples on it. It also happens after a good workout (my racquetball opponent pointed it out to me after our game today).

I thought it might be the soap I use or the shaving cream I use (I shave my head), but that would only make sense if it only happened after a shower. It seems to happen more after a shower, but it's also happening after workouts, when I'm sweaty and my body temperature is up.

Does this sound familiar? Does anyone else have this, or does anyone have any ideas what this could be?

Thanks!