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Doctors don't know exactly what causes eczema. The most common type of eczema -- atopic dermatitis -- resembles an allergy. But the skin irritation, which is more often seen in children rather than adults, is not an allergic reaction. The current thinking is that eczema is caused by a combination of factors that include: Genetics.
By contrast, the following are some possible reasons why heat seems to worsen eczema: 1  Warm and dry conditions promote the evaporation of water from the surface of the skin, thereby drying it out and making eczema more likely. 2  Sweat acts as an irritant on the skin, particularly in humid conditions.