What will help a heat rash?

Keep cooler: Heat rash usually resolves in a few days unless you continue to sweat too much. So dress in cooler clothes or remove a layer of clothes, blankets, etc. Try not to use any topical creams or ointments that can also hold in heat. Keep cooler and the rash should go away on its own. Cool water will feel good on the rash. Solarcaine gel would help with comfort also.