What Helps Against
Heat Rash?

The sun is only one of the indirect causes of heat rash, as it raises temperatures in summer. The main cause of these blisters on the skin is clogged sweat glands: when ambient temperature and humidity are high, our body cannot release enough perspiration to the outside, which can block the sweat glands.

The appearance of heat rash can vary greatly depending on the layer of skin where the sweat glands are blocked. If this blockage occurs in the upper layer of the skin, clear, pinhead-sized blisters filled with fluid (miliaria crystallina) appear. If the problem is deeper in the epidermis, red and irritating bumps (miliaria rubra) tend to develop. This form of heat rash becomes inflamed more easily, often itches and can also be painful.

Heat rash is particularly common where heat accumulates easily, for example under the armpits, behind the knees or in the groin area. In most cases, this heat rash is mild and harmless. The milder form disappears by itself after a few hours once the body is no longer exposed to humid heat and sweats less. In more pronounced cases, the healing process can take several days. Keep the skin dry and avoid scratching. If the itching is very intense, it is advisable to consult a doctor.

Consequences of heat build-up on the skin

In tropical regions there is a constantly hot and humid climate. Sweat barely evaporates and therefore does not cool the body sufficiently. If your skin is sensitive, heat rash can easily appear. But even in our latitudes, sweating can cause heat rash: for example in summer, when heat builds up due to clothing that is too tight or when sweat cannot evaporate during exercise. It is therefore important to wear light clothing that allows the skin to breathe.

What to do about heat rash in young children?

Young children and babies often suffer from heat rash because their sweat pores are not yet fully mature. They clog more easily and heat rash appears. Parents should therefore be careful not to overdress their child when it is hot. Loose, lightweight baby clothes allow sensitive skin to stay well ventilated and help prevent heat build-up.

Heat rash or sun allergy: what is the difference?

Unlike heat rash, sun allergy is not caused by heat but by UV radiation. In this case, skin rashes develop on areas of skin that have been heavily exposed to the sun. Heat rash, on the other hand, often occurs in skin folds in areas with many sweat glands, such as the armpits, groin area, behind the knees or between the shoulders.