Contact dermatitis, also known as contact eczema or allergic dermatitis, is, as its name says, an inflammation of the skin that occurs when it comes into contact with a substance that causes allergy or irritation.
The skin is one of the most frequently affected organs by allergic processes. There are several causes for skin allergy, but they all usually present with two characteristics: rash (spots or reddish patches on the skin) and severe itching.
Seborrheic dermatitis, also known as seborrheic eczema, is a common skin disease and non-serious. This form of dermatitis is a chronic inflammation that occurs in skin areas that contain large numbers of sebaceous glands.