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What is the best way to prevent heat rash?

I often go jogging for exercise, and on particularly cold or windy days, I experience a heat rash across my forearms and chest. I usually drink plenty of water and I don't push myself too hard. I am not currently diagnosed with any chronic ailments, nor am I allergic to the fabric of the shirt.
Heat rash occurs when the sweat glands in the skin become clogged by dead skin and other debris. This is usually brought about by excessive sweating and chafing of the skin while exercising in hot weather. Typically treatment of heat rash includes good skin hygiene, gentle exfoliation, and applying an anti-chafing barrier product when running (there are many of these available from most sports or athletic supply stores). However, it sounds like what you are dealing with may not be heat rash, since it seems to be provoked by cold and wind. I think this is more likely just to be straight forward chafing and skin dryness. Of course, treatment is partially similar, as using an anti- chafing barrier will be important. However, I think the key for you will be good skin moisturizing before and after running. Also, you may want to avoid particularly long or hot showers as these tend to dry out the skin even more. If you try these approaches and your symptoms worsen or do not improve, you may want to talk with your primary care doctor. Occasionally, reddened and itching skin does not respond simply to moisturizing and may require a topical steroid cream.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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