文档介绍：Seborrheic Dermatitis Seborrheic Dermatitis ? also known as "seborrheic eczema “? is an inflammatory skin disorder affecting the scalp, face, and trunk causing scaly, flaky, itchy, red skin. ? It particularly affects the sebum-gland rich areas of skin. Etiology ? The cause of seborrhoeic dermatitis remains unknown ? Malassezia globosa , may play a role. ? Seborrhoeic dermatitis may be aggravated by illness, psychological stress, fatigue, change of season and reduced general health. Etiology ? Neurologic conditions, including Parkinson's disease, head injury, and stroke may be associated with seborrheic dermatitis. ? Human immunodeficiency virus (HIV) has also been linked to increased cases of seborrheic dermatitis. Etiology ? In children, excessive vitamin A intake can cause seborrhoeic dermatitis. ? Lack of vitamin B6 and vitamin B 2 may also be a cause Etiology and Pathogenesis ?遗传性皮脂溢出感染马拉色菌、痤疮丙酸杆菌等皮脂成分改变感染性变态反应脂溢性皮炎精神、饮食、维生素 B缺乏、嗜酒 Clinical Manifestation ? Seborrheic dermatitis can occur on many different body areas. Typically it forms where the skin is oily or greasy. ? Lesion papule oily and yellow scales , ? severe cases, yellowish to reddish scaly papule appear along the hairline, behind the ears, ear canal, eyebrows, bridge of the nose, around the nose, chest, back. Clinical Manifestation ? in some cases hair loss ? Itching-- may e more itchy if infected ? Infants younger than three months thick, oily, yellowish crust around the hairline and on the scalp ? Course last from few weeks to even years