I get skin rash (itchy and red) whenever i get hot or when i am nervous, is there way to eliminate or reduce the rash? thank you.

Try an antihistamine: It's a chemical response that you're experiencing. You might try an antihistamine on a regular basis, (Zyrtec) and see if that helps. More then likely it's YOU, and you aren't going to be able to change it.

Stress urticaria: You may have stress urticaria. Treating the stress may help. See a Dr. for an evaluation as medication such as Hydroxyzine HCL is FDA approved for both itching and anxiety, and may be beneficial for this condition.