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Could it be heat rash? I exercised yesterday and got hot. I read that it could be caused by sweat.

Yes, heat rash can occur after exercising and getting hot. It is caused by sweat getting trapped in the pores, forming small red bumps. It is important to avoid hot showers and use gentle, fragrance-free moisturizers to help soothe the irritation. If the rash persists or gets worse, it is recommended to consult a doctor for further evaluation and treatment.