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1 Make a paste of gram flour and a little water and apply to the skin rash. 2  Leave it on for about fifteen minutes and then wash off with cool water. 3  Combine one teaspoon each of sandalwood powder and coriander and apply to the affected area. 4  Fullers earth is a highly beneficial treatment for prickly heat.
Answer. Heat rashes, also called prickly heat rash, can occur in hot, humid conditions. The medical term is miliaria.. Because the temperature is hot, you sweat a lot in an attempt to cool off. However, because it is humid the sweat doesn't evaporate and the outer layer of your skin becomes soaked, swells, and the openings for your sweat glands close off. This causes a build up of sweat underneath your skin.