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heat rash

heat rash

1 3.5
A skin irritation with small red bumps that appears when it is hot and humid
  • noun
  • /hit ræʃ/
translation icon : erupción por calor
  • Then we returned to the road where the hot, melting asphalt caused heat rashes on our feet and legs.
  • prevent a heat rash
  • develop a heat rash
  • get a heat rash

Examples

  • To relieve a heat rash, apply cool compresses to soothe the irritated skin.

  • Let's hope it's just a heat rash.

  • I've got a heat rash or something.

  • One of his powders was good for heat rash.

    Fiction book (1991)
  • By nightfall, his body has developed a heat rash across its chest.

    Fiction book (1995)
  • My oldest got a really bad heat rash at 6 months that turned into a diaper rash that would not go away.

    Blog text (30)
  • During the summer, he often gets a heat rash when working outside in the humid weather.

  • After spending the day at the beach, she noticed a heat rash on her back due to the heat and sweat.

Synonyms

prickly heat
vsheat rash
  • UK
1 7.0

A skin rash with small itchy red spots in hot, wet weather

is the neutral medical description for that same sweat-duct blockage rash
miliaria
vsheat rash
  • Specialized
9.9

A skin rash of small itchy spots caused by blocked sweat pores in hot weather

is the common descriptive phrase used in ordinary speech for this rash

How Severe

heatstroke
  • Specialized
7 4.0
heat exhaustion
  • Specialized
5 4.0
heat rash
1 3.5
crampy
1 4.1

Surface Forms

heat rash singular
heat rashes plural

Morphology

heat + rash

The meaning is directly and transparently derived from the constituent words: 'heat' (high temperature) + 'rash' (red, itchy skin spots) clearly indicates a rash caused by heat. This compositional biomedical concept is common cross-linguistically, so a B1 learner who knows both words would readily infer the MWE's meaning.

Etymology

Heat rash comes from a simple image: when the skin gets very hot and sweaty, the sweat ducts can become blocked and the skin forms tiny red bumps. So the parts heat (hot conditions) and rash (skin irritation) explain why it means 'a skin irritation caused by blocked sweat ducts'.