Lichen Planus Introduction
Lichen Planus is an uncommon, inflammatory papulosquamous disorder of unknown etiology.
The skin, nails, hair and mucus membranes may be affected. Lichen planus is rare in children aged under 5 and more common in women than in men. 10% of patients have a positive family history.
The clinical course of lichen planus is variable and unpredictable. Itching is variable, but is usually intermittent and insatiable. Severe oral lichen planus may degenerate to squamous cell in an estimated 3% of cases.
The primary lesion is a 2?0 mm flat-topped papule with an irregular, angulated border, a polygonal papule. New lesions are pink and white, but over time they become purple and sharply defined. Surface shows a lacy reticulated pattern of whitish lines known as Wickham’s striae. New lesions may develop in areas of injury, the Koebner phenomenon. There are several clinical forms.