I have a really really bad problem with my skin. Whenever I go outside the sun, or the heater, in general wherever it's hot, my skin gets extremely prickly and it has many red bumps all over my body. I've tried many allergy medicines such as HYDROXYZINE HCL, DOXEPIN, FEXOFENADINE, XYZAL, ZYRTEC, but they didn't help the breakout at all. I think I'm not allergic with anything, because I already took the blood test, and everything appeared negatively.