Here are some ...: If what you concerned is truly heat rash, it should go away in 3-5 days after giving the affected area a good clean & dry environment with regular care + adequate ventilation. But, oftentimes, the rashes in the areas you described may have skin yeast infection, for which applying antifungal - steroid cream lightly once or twice daily will help quickly in 2-3 days. For detail or in doubt, see Doc.
Answered 11/28/2017
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