Classical lichen planus is characterized by shiny, flat-topped, firm papules (bumps) varying from pin point size (‘guttate') to larger than a centimetre. They are a purple colour and often are crossed by fine white lines (called ‘Wickham's striae'). They may be close together or widespread, or grouped in lines (linear lichen planus) or rings (annular lichen planus). Linear lichen planus can be the result of scratching or injuring the skin. Although sometimes there are no symptoms, it is often very itchy.
Lichen planus may affect any area, but is most often seen on the front of the wrists, lower back, and ankles. On the palms and soles the papules are firm and yellow. Very thick scaly patches are particularly itchy and are most likely to arise around the ankles (hypertrophic lichen planus).
New lesions may appear while others are clearing. As the lichen planus papules clear they are often replaced by areas of greyish-brown discolouration, especially in darker skinned people. This is called postinflammatory hyperpigmentation and can persist for months.
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