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.
There are many different types of eczema. 1  Atopic dermatitis is a form of eczema related to the same immune reaction that underlies allergy and asthma (atopic disease). 2  The condition tends to be chronic. 3  Contact dermatitis results when allergens or irritants provoke skin inflammation.