Lichen planus and lichen-planus-like reactions.

Lichen planus is a common disorder affecting the skin, oral and genital epithelium, hair and nails. It is said to account for approximately 1% of new patient referrals to skin clinics (Samman, 1979). It is, therefore, an important entity to the dermatologist. However, lichen planus and lichen-planus-like reactions have been described in a number of clinical situations which may bring them first to the attention of doctors practising in other specialties.