Hi,
Heat rash looks like a red cluster of pimples or small
blisters. It is more likely to occur
on the neck and upper chest, in the groin, under the breasts, and in elbow creases.People suffer heat-related illness when the body's temperature control system is overloaded. The body normally cools itself by sweating. But under some conditions, sweating just is not enough and may manifest as the rash, If you live in a humid and hot environment, this is more likely.