This fairly common dermatological condition may predispose to cutaneous malignancy. Familial cases have been described, and in these cases, the disease affects younger individuals and is a more widespread eruption (also spreading to involve nails and mucous membranes) than in isolated cases (Sandhu et al. 2003). There may be genetic heterogeneity in etiology in lichen planus, with idiopathic cases of cutaneous lichen planus showing some HLA associations (La Nasa et al. 1995; Sandhu et al. 2003).