What Causes Heat Rash?

Heat rash is a condition that happens when sweat gets trapped underneath the skin. The rash usually manifests as many small blisters on the surface of the skin. Some other names for heat rash are miliaria and prickly heat rash. The latter name comes from the fact the rash often feels prickly. While heat rash tends to be associated with young babies, individuals of any age can get heat rash. A variety of things can cause heat rash in adults. Often, heat rash happens when someone sweats a lot and does not get a chance to wash the sweat off soon enough.