Final answer:
Seborrhoeic dermatitis is a common skin condition characterized by inflammation and redness of the skin, often affecting areas rich in sebaceous glands such as the scalp, face, and upper body. It can cause scaly, itchy, or oily patches and in severe cases, sores on the lips and inflammation of the tongue.
Step-by-step explanation:
Seborrhoeic dermatitis is a common skin condition characterized by inflammation and redness of the skin, particularly areas rich in sebaceous glands such as the scalp, face, and upper body. It may present as scaly, itchy, or oily patches of skin. In severe cases, it can cause the formation of flaky and crusty sores on the outer surface of the lips and inflammation and redness of the tongue.