Does heat and sweat also cause eczema?

It won't cause eczema per se but it can aggravate an existing eczema condition. I had eczema as a child but it's mild now as an adult. It does get aggravated every now and then in Singapore's humid and hot weather, especially in my neck area.

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yes it is possible. for my son heat and sweat makes him get all red and he starts itching.