Soaps and detergents such as sodium laureth sulfate may precipitate a flare-up, as they strip moisture from
the top layers
of the skin, and
the drying property
of these can cause flare-ups and may worsen the condition.
Avoid using these and choose a suitable alternative for cleansing the skin.
Or it could just be xerosis.Xerosis is the medical term for dry skin. It can have many different causes, including general dehydration, Vitamin A deficiency, and diabetes.