Seborrheic Dermatitis Seborrheic Dermatitis appears as lesions or rashes covered by sometimes oily, yellowish or whitish scale. This condition can appear on areas of the skin which have an abundance of oil glands, typically the scalp, nose, and eyebrows. As with Dandruff, the rapid build-up and scaling of cells is one aspect of the problem and results in flakes and itching. Scalp Psoriasis Psoriasis is characterized by accelerated cell production and thickening of the outer layer of the skin. These cells do not eventually flake, but build up to form plaques.
Plaques are reddish and silver-scaled, and they often itch.
They sometimes cover large areas of the scalp, and can be very difficult to treat. The exact cause of Psoriasis is unknown, but immunological and biochemical abnormalities are contenders. Psoriasis also tends to run in families. In most cases, Psoriasis can cause a substantial amout of hair loss. There are many factors that may contribute to scalp inflammation.