Medically Reviewed by Dr. Lee Hwee Chyen
MBBS MRCP (UK) FAMS (Dermatology)
Heat rash, also known as prickly heat or miliaria, is a skin condition due to blocked sweat ducts. This blockage traps sweat under the skin, leading to inflammation and rash and is characterized by small, red bumps on the skin, which can feel itchy or prickly. This condition is prevalent in hot and humid climates, like Singapore’s, where excessive sweating can easily clog pores.
Heat rash typically affects areas of the body where friction is common, such as the underarms, back, breasts, and groin. While it’s often seen in infants, adults can also develop heat rash in conditions that promote heavy sweating.
Drinking adequate amounts of water helps regulate your body temperature and facilitates the efficient evaporation of sweat, which can prevent the sweat ducts from becoming blocked. It’s recommended to drink at least 8-10 glasses of water daily, but this amount should increase when spending extended periods in the heat or engaging in physical activity.
Incorporating hydrating foods into your diet, such as fruits and vegetables with high water content, can also support hydration efforts.
Opt for loose-fitting, lightweight, and breathable fabrics that allow air circulation to your skin and facilitate sweat evaporation. Materials like cotton, linen, and moisture-wicking fabrics are ideal as they help keep the body cool and dry by absorbing sweat and allowing it to evaporate quickly. Avoid wearing tight clothing and synthetic fabrics that trap heat and moisture against your skin, creating an ideal environment for heat rash to develop.
Opting for shaded or indoor spaces during the hottest parts of the day (between 10 a.m. and 4 p.m.) can significantly reduce the risk of excessive sweating and heat rash. Utilizing fans or air conditioning helps in maintaining a cooler environment, promoting sweat evaporation and lowering skin temperature.
On days when the heat reaches extreme levels, it’s advisable to stay indoors, where temperatures are more controlled. Products like cooling gels or patches can offer targeted relief to areas prone to heat rash, further assisting in keeping the body cool and comfortable.
Excess moisture on the skin can lead to clogged sweat ducts, creating the perfect conditions for heat rash to develop. Always pat the skin dry gently after sweating or taking a shower, avoiding rubbing that can irritate the skin further.