Being eighteen years old and 180 pounds, I've always thought of myself as pretty fit, I keep a good diet and do a lot of walking. I can definitely outpace and outlast most people I know, no problem. Despite this, in recent years I've found that whenever my body gets to the point where I should be sweating, I instead almost inevitably start getting the feeling like there are thousands of little mosquitos biting at my torso and scalp. It's really quite annoying, trying to walk along resisting the urge to strip my clothes off and rake my skin against the cement--it really does get like that. Whenever this happens, I'll get home and do just that, except replacing the cement with the coldest wash cloth I can get. It eventually does die down, and there's no physical proof of it ever happening, no redness or rash or anything. For a while I thought it was a reaction to warm temperatures until it struck twice, once today and once the day before, near the end of a walk in the cold. That's the worst, when half my body feels like it's on fire and the other half is freezing.

I post this here in the skin disorders section because the only thing I can think of to explain it is that I haven't been washing my skin hard enough, even though I'm sure I have. Do these sound like symptoms for that sort of thing? Are my pores somehow blocked?