Factors that make you more prone to heat rash include:

  • Age. Newborns are most susceptible.
  • Tropical climates. People living in the tropics are far more likely to have heat rash than are people in temperate climates.
  • Physical activity. Anything that makes you sweat heavily, especially if you're not wearing clothing that allows the sweat to evaporate, can trigger heat rash.
Jan. 20, 2015