Although it is generally believed that 10% to 15% of the adult population suffers from chronic insomnia, and an additional 25% to 35% have transient or occasional insomnia, prevalence estimates vary because of inconsistent definitions and diagnostic criteria.
What is Seborrheic Dermatitis? Considered a chronic form of eczema, seborrheic dermatitis appears on the body where there are a lot of oil-producing (sebaceous) glands like the upper back, nose and scalp. The exact cause of seborrheic dermatitis is unknown, although genes and hormones play a role.
Like psoriasis, seborrheic dermatitis most often clears and flares throughout the lifetime. Seborrheic Dermatitis Certain skin diseases look like psoriasis but actually fit another diagnosis. One example of this is seborrheic dermatitis, a red, itchy rash that appears most often (but not always) on the scalp.