Seborrheic Dermatitis

Seborrheic dermatitis is a very common condition that affects the scalp, behind the ears (with small fissures and cracks), can cause redness and fine scale around the medial portion of the eyebrows, around the nose, and can even affect the skin between the breasts in men and women. Seborrhea of the scalp is also called dandruff (though there is more than one type of dandruff) and manifests as greasy, yellowing scale and sometimes a thick yellowish buildup of itchy patches scattered thoughout the scalp. Those with very oily skin and who sweat excessively will experience more seborrhea. This is due to an overgrowth of the naturally occurring yeasts called pityrosporum or malassezia. These yeast thrive on the oils in the skin and then elicit an inflammatory reaction from the immune system. This reaction is likely what causes the skin to become pinkish and red in areas that are affected by seborrhea.