DermaTechRx Research Center

Prevent Heat Rash

Hot, humid weather contributes greatly to miliaria or heat rash. It is more probable when you first move to the tropics from a different climate. Once your body becomes acclimated, which usually takes several months the problem typically disappears.  Physical activity, intense exercise, hard work or any activity that causes you to perspire extensively can also lead to heat rash.  You may develop heat rash if you consistently wear clothing that doesn’t allow perspiration to evaporate normally. Certain prescription medications have been linked to heat rash.

Some bacteria normally found on the skin, such as Staphylococcus epidermis, secrete a sticky substance that may block sweat ducts. Overheating in general will make you vulnerable to heat rash.  Things like putting on too many clothes in winter and sleeping under an electric blanket can lead to heat rash. So can using heavy creams and ointments, which block the sweat ducts. Heat rash can also occur in people who are confined to a hospital bed for long periods.

When your core temperature rises, your autonomic nervous system stimulates the eccrine glands to secrete perspiration. The perspiration travels through ducts to the surface of your skin, where it cools your body as it evaporates. Heat rash develops when some of the eccrine sweat ducts become plugged. Instead of evaporating, perspiration remains trapped beneath the skin, causing inflammation and rash. To help protect yourself or your child and prevent heat rash try the following suggestions:

·         In summer, dress in soft, lightweight, cotton clothing. Avoid excessive bundling up in winter, children should wear the same amount of clothing that an adult would wear to stay comfortable.

·         Avoid tight fitted clothes that can irritate skin.

·         When it’s hot, stay in the shade or in an air-conditioned building or place a fan at a safe distance to gently circulate the air.

·         Keep your sleeping area cool and well ventilated.

·         Bathe in cool water with a nondrying soap that doesn’t contain fragrances or dyes. Many companies make gentle, natural products especially for infants and children.

·         Avoid using powders, creams or ointments because they don’t prevent heat rash and can block pores.

·         In hot weather, dress in loose, lightweight clothing that wicks moisture away from your skin.

·         Spend as much time as possible in air-conditioned buildings.

·         After bathing, let your skin air-dry, instead of toweling off.

·         Use calamine lotion or cool compresses to calm itchy, irritated skin.

·         Avoid using creams and ointments, which can block pores further.