Eli5: As somebody with eczema, why can’t dry skin just be rehydrated by water, why does water make it worse, especially hot water I’ve been told

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I get really bad eczema on my hands, and the doctors tell me I wash my hands too much, never knew that was a thing but I work in a restaurant so don’t really have a choice. But I just don’t understand why we need lotion or prescribed ointment, why can’t I just skin my hand in a tub of water for an hour and bam hydrated.

In: Biology