Seborrheic Eczema, also known as Seborrheic Dermatitis, is a very common skin condition that causes redness, scaly patches, and dandruff. It most often affects the scalp, but it can also develop in oily areas of the body, such as the face, upper chest, and back. Seborrheic dermatitis of the scalp symptoms include red skin covered with greasy-looking white or yellowish scales and Skin flakes (dandruff) that may attach to the hair shaft.