June 3, 2025, 3:17 pm | Read time: 3 minutes
Some of you probably know the feeling: Summer calls, temperatures rise, and so does the anticipation for shorts and breezy dresses. But with the first summer temperatures, many people also notice small, red heat rashes appearing on their bodies. So how does this itchy rash develop, and what can be done about it? STYLEBOOK has the answers.
Heat rash thrives in warm temperatures and usually appears as a red, itchy skin rash. But there’s no need to worry–these small red spots are mostly harmless and can be alleviated or even completely avoided with these tips.
Overview
How Heat Rash Develops
Heat rash, also known as miliaria, primarily occurs due to heat and sweat. When summer temperatures rise, we naturally sweat more. If sweat cannot properly evaporate from the skin’s surface, pores become clogged–resulting in itchy red inflammations or light spots on the skin. Another factor that promotes the development of heat rash is tight clothing.
In warm weather, it causes friction and can further block sweat ducts. Heat rash often appears in areas where it is warm and friction is intense–such as the back, chest, groin, or underarms. However, even though they may feel and look unpleasant, these small bumps are generally harmless and can disappear with proper care in a few days.
How to Avoid Heat Rash
To prevent heat rash from developing in the first place, direct sunlight should be avoided as much as possible. Those who sweat a lot should shower regularly to wash away excess sweat–then dry the skin thoroughly, especially in skin folds. Gentle exfoliants, such as enzyme or fruit acid peels, can also help keep pores clear and prevent blockages. However, if the rash is already present, caution is advised: avoid exfoliants to prevent further irritation of the skin.
Care should also be taken with skincare. Rich sunscreens or perfumed lotions can irritate the skin and clog pores. It’s better to opt for light creams for sensitive skin.
Choosing the Right Clothing
It’s also worth paying attention to clothing choices. Ideal are airy, lightweight fabrics like cotton, viscose, or linen. Loose cuts and light colors further help the skin breathe even on hot days.
Synthetic fibers like polyester, spandex, or nylon, on the other hand, have little breathability, which can lead to increased sweating, unpleasant odors, and–consequently–heat rash in the summer.
An often underestimated trick: regularly wash clothing with a mild detergent. If you’ve sweated heavily and wear the garment again without thoroughly cleaning it, bacteria can accumulate in the fibers–which can further clog pores and promote inflammation.
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What Helps Against the Rash
If the small bumps are already present, cooling compresses and cold showers can help relieve itching. It’s also important to avoid wearing tight clothing to allow the skin to breathe. Special gel creams and ointments can soothe the irritated areas. It’s also advisable to avoid direct sunlight for a while to give the skin time to regenerate.