Well, this is a forum for people with Chronic Fatigue Syndrome. If anyone knows about rashes, they might reply, but I'm doubting it. It sounds like you're getting too much fake sun, especially if the bumps are blisters (which indicates a 2nd degree burn). The best I can advise you to do is see your Dr. Of course the tanning salon isn't going to tell you anything, because they would be liable if there was a problem (unless you signed away your rights in some kind of contract). But just call your Dr and say you need to be seen right away. And DON'T go back to the tanning salon!
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* Moderator for Chronic Fatigue forums