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Heat rash is a common skin condition

The purpose of sweat is to evaporate and cool your body. Wearing non-porous covers, such as plastic baby diapers, oily make-up or tight-fitting garments, however, will hold the sweat within the glands. This may lead to an irritation of the glands and the formation of small red pimples or even blisters – symptoms of heat rash. It isn’t generally serious, but can develop into a secondary skin infection. Hot and humid weather is almost always the cause, but obesity, genetic factors and sensitive skin also add to your chances of heat rash.

Heat rash – also known as prickly heat and baby rash – is more common amongst the very young, because their underdeveloped sweat glands clog easily. Even in winter an overdressed infant in a wet diaper can develop the red pimples between the legs and on the buttocks.

Prevent heat rash by removing the cause of the sweat gland blockage. Don’t wear tight-fitting and non-porous garments in the summer heat. Avoid oily ointments and creams where possible and wash off any sweat or dirt. Change baby diapers regularly and apply moisture-absorbing powder. If prevention comes too late, your pharmacy has an antiseptic cleanser or soothing remedy.

Although heat rash is a non-serious and common medical condition in babies, it is also a sign that the infant is too hot, and may progress to a more dangerous heat-related disorder.

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swollen legs

heat cramps

miliaria, miliaria rubra,

sweat rash, prickly heat

Miliaria rubra

The most commonly encountered form of the illness is miliaria rubra, in which obstruction causes leakage of sweat into the deeper layers of the epidermis, provoking a local inflammatory reaction giving rise to the typical appearance of redness (hence rubra) and larger (but still only a few millimetres) blister-like lesions. This form of the illness is often accompanied by the typical symptoms - intense itching or "pins and needles" with a lack of sweating (anhidrosis) to affected areas. There is a small risk of heat exhaustion due to inability to sweat if the rash affects a large proportion of the body's surface area and/or the sufferer continues to engage in heat-producing activity.

Source: Wikipedia