Stop eating the food or using the medicine that may be causing the rash, and talk to your doctor about it. If you get hives often, ask your doctor to recommend an antihistamine to relieve the itchiness. For temporary relief from itching, apply witch hazel or rubbing alcohol, bathe in lukewarm water and baking soda, or apply calamine lotion. While it sounds hard to believe, you may get heat rash during the summer or winter. Heat rash may be caused by prolonged periods of hot weather or by overdressing during the cold months.
Heat rash leaves skin rough, red and covered by pinhead-sized pimples.
To relieve irritation, dress in lightweight, loose-fitting cotton clothes. A rash that lasts longer than a day can signal other problems. See your doctor for treatment.