Lichen simplex (neurodermatitis) is a form of eczema (see DERMATITIS) perpetuated by constant rubbing of the affected skin. Typically, well-de?ned plaques occur on one or both sides of the nape of the neck, on the ulnar forearm near the elbow, or on the sides of the calves. It is often associated with emotional stress.
Lichen planus is a less common in?ammation of the skin characterised by small, shiny, ?at-topped violaceous papules which may coalesce to form large plaques. Itching can be intense. Typically seen on the ?exor aspects of the wrists, the lower back and on the legs below the knees, it may also affect the mucous membranes of the mouth and lips. The cause is unknown. While in some patients the disorder appears to be nervous or emotional in origin, it can be caused by certain drugs such as CHLOROQUINE. Severe cases may require oral CORTICOSTEROIDS to control the eruption.
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