What is heat rash?
Heat rash, also called miliaria or prickly heat, is a skin irritation that stings and makes your skin red. If you have heat rash, your skin may feel itchy, small bumps may form, and you may feel some “prickly,” tingling pain.
Heat rash occurs most often in hot, humid weather. If you sweat too much, sweat can get trapped under your skin and block your sweat glands. If your pores cannot clear out the sweat, you may get a rash.
Written by familydoctor.org editorial staff