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Definition of Heat rash
1. Noun. Obstruction of the sweat ducts during high heat and humidity.
Medical Definition of Heat rash
1. An eruption of papules and vesicles at the orifices of sweat glands, accompanied by redness and inflammatory reaction of the skin. Synonym: heat rash, lichen infantum, lichen strophulosus, prickly heat, strophulus, summer rash, tropical lichen, lichen tropicus, wildfire rash. (05 Mar 2000)