What is the wet-dry cycle?

Q:  What is the wet-dry cycle, and why is it bad for eczema?

A:  The wet-dry cycle refers to the drying of skin dampened with water or perspiration. Imagine a muddy field: if the sun dries the field quickly, the mud cracks; if it dries slowly on a cloudy day the mud stays smooth. Skin with eczema is especially likely to crack in low humidity conditions when it dries quickly. Applying a moisturizer to slow the drying of wet skin is therefore especially important in the winter when the humidity is lower.