Hi,
Seborrhoeic eczema (also Seborrheic dermatitis AmE, seborrhea) is a skin disorder affecting the
scalp, face, and trunk causing scaly, flaky,
itchy, red skin. It particularly affects the sebum-gland rich areas of skin.
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.