Seborrhoeic dermatitis (seborrhea) is a skin disorder affecting the scalp
, and trunk causing scaly, flaky, itchy
, red skin.
The exact cause of seborrhoeic dermatitis is not known, although many factors have been implicated. The widely present yeast, Malassezia furfur as well as genetic, environmental, hormonal, and immune-system factors have all been implicated. This is a fat-eating fungus which lives on the scalp of most healthy adults without causing any problems.