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What are the causes of heat rash?
It is uncertain why some people get heat rashes and others don't.
The sweat gland ducts can get blocked if gexcessive sweatingoccurs, and that sweat is not allowed to evaporate from a specific area. Some examples of how blockage may occur include the following:
- Creases in the skin like the neck, armpit, or groin have skin touching adjacent skin, which makes it difficult for air to circulate preventing sweat evaporation.
- Tight clothing that prevents sweat evaporation.
- Bundling up in heavy clothing or sheets. This may occur when a person tries to keep warm in wintertime or when chilled because of an illness and fever
- Heavy creams or lotions can clog sweat ducts.
Babies have immature sweat glands that aren't able to get rid of all the sweat they produce, which can cause a heat rash if they are exposed to warm weather, are overdressed, excessively bundled, or have a fever.
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