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Heat Rash also can appear as large, reddened areas of skin. Babies and children are also more likely to be affected than adults because of their underdeveloped sweat glands, in which case the rash is commonly found in the nappy area and in the skin folds or on the neck. Heat Rash can also occur in cooler climates when sweating is a problem.

The most important step in preventing heat illness is to hydrate before, during, and after physical activity. Dehydration is common in all heat illnesses. Mild dehydration (2%) can decrease athletic performance as well as decrease the body's ability to regulate temperature. Thirst in not a good indicator of dehydration, because it is activated when the body is already 2-3% dehydrated. You should drink 8-12 ounces of fluid before exercise, and every 20 minutes during exercise.