Seborrheic dermatitis is an inflammatory skin disease where scaling of the skin occurs. Seborrheic dermatitis is not usually a dry skin condition as the skin is producing its normal oil (sebum). However the appearance of skin scaling often leaves sufferers to believe that the condition occurs due to excessively dry skin or a lack of sebum.
A skin fungus is an infection of the skin by a fungus, a microorganism that usually consumes dead material. The outer skin is made up of dead skin cells that form a barrier to the outside environment. This barrier is usually able to maintain its own health but if damaged (especially by breaks or a cut in the skin), it can be prone to infections. There are certain types of fungi – dermatophytes (molds) and yeasts - which can quickly invade and establish itself on the skin surface in the optimal settings.