The price we pay for living in a modern, civilized, sanitized convenience world is that we are in contact with more pollutants, additives, chemicals and detergents than every before. As a direct result, the incidence of allergies has exploded in recent years.
Allergies can take many forms but when manifested as an inflammation of the skin, an allergic reaction is often diagnosed as dermatitis – better known as eczema. That said, there are cases where dermatitis appears without any known cause but, in its commonest form, atopic dermatitis usually affects people with a family history of asthma and hay fever - the other common allergies. The other most prevalent forms are seborrheic dermatitis and contact dermatitis (eczema).
Serborrheic dermatitis is a red, scaly, itchy rash that develops on the face (particularly the nose and eyebrows), scalp, chest and back. On the scalp, it is the most common form of dandruff. The rash often develops at times of stress but its exact cause is not known. It is believe to be an overreaction to the natural yeasts in the skin and it seems that keeping the yeast levels low helps to keep the condition at bay.