WebMD Answers
The best treatment for heat rash is to provide a cooler, less humid environment. Keep the affected area dry. Dusting powder may be used to increase comfort, but avoid using ointments or creams; they keep the skin warm and moist and may make the condition worse.
Treating heat rash is simple and usually does not require medical assistance. Other heat-related problems such as heat stroke or heat exhaustion can be much more severe.
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