Heat rash


No specific tests are necessary for diagnosing a heat rash. It is often identified by inspecting the rash on the skin and inquiring about the symptoms, with a focus on the duration of symptoms and potential triggers such as intense physical activity or residing in a humid climate.

A similar-looking condition, transient neonatal pustular melanosis (TNPM), can be observed in newborns with brown or black skin. TNPM is harmless and usually resolves on its own within a few days without the need for treatment.


Heat rash treatment often involves cooling the body or skin down. Mild heat rashes typically disappear in a day, while on average, they may last for two to three days. Without treatment, more severe heat rashes can endure for up to a couple of weeks.

Depending on the severity of the heat rash, home treatment options include:

  • Utilize a fan or air conditioner in hot or humid conditions, take cool showers, and gently pat the skin dry or allow it to air dry to prevent further irritation.
  • Opt for clothing made of cotton, which facilitates airflow between the fabric and your skin. Steer clear of synthetic materials, as they tend to retain heat.
  • For groin-area heat rashes, consider going without undergarments temporarily. Babies with diaper-related heat rashes can benefit from a few hours without a diaper.
  • Use a moisturizer with wool fat or anhydrous lanolin to prevent clogging of sweat ducts. Do not use oily or greasy products like moisturizers, cosmetics, and sunscreens that can clog pores.
  • In case of intense itching or discomfort resulting from heat rash, your healthcare provider may suggest utilizing a corticosteroid cream or calamine lotion to alleviate the affected area.