Heat rash (prickly heat)
Overview
Heat rash is uncomfortable, but usually harmless. It usually gets better on its own after a few days.
Symptoms
The symptoms of heat rash are: small, raised spotsan itchy, prickly feelingmild swelling The rash looks red on white skin. It may be harder to see or look grey or white on brown or black skin. The symptoms of heat rash are often the same in adults and children. It can appear anywhere on the body and spread, but it cannot be passed on to other people.
Causes
Heat rash is usually caused by sweating a lot. Sweat glands get blocked and the trapped sweat leads to a rash developing a few days later. Babies often get heat rash because they cannot control their temperature as well as adults and children can.