Usually beginning on the scalp as oily, waxy patches, this common type of eczema sometimes spreads to the face and beyond. A severe case, while rare, produces widespread lesions. Like most types of eczema, seborrheic dermatitis tends to flare in cold, dry weather.
Signs and symptoms can vary from day to day and include:
While the exact cause is not known, researchers believe that a number of factors interact to cause seborrheic dermatitis. These factors include the genes we inherit, yeast that normally live on human skin, stress, climate, and overall general health.
The following tend to increase the likelihood of developing seborrheic dermatitis: