Suncare Facts - Prickly Heat / Heat Rash An itchy rash of small, raised red spots that cause stinging or a prickling sensation on the skin caused by excessive perspiration, usually in a hot, humid environment. Chemical laden sunscreens block pores, trapping heat and sweat in the skin causing the characteristic bumps. 100% natural and organic sun lotions allow skin to breathe, stop overheating and alleviate symptoms. Prickly Heat can take a few days to manifest so use natural lotions from Day 1 of your holiday. Once out of the sun when the skin is cooled and dried, follow up with a natural Aloe Hydrator to continue the healing and conditioning the skin.