Carcinoma occurring in the cutaneous lesions of Lichen Planus though rarely mentioned in literature does occur and should be kept in mind while treating such lesions. We report a 16 year female who developed a squamous cell carcinoma in a long standing verrucous lichen planus in the lower leg. This case is being presented to indicate the possibility of malignant transformation of cutaneous lichen planus to carcinoma, especially in the hypertrophic forms and the need to have an early diagnosis so that it can be treated in the initial stages. A high degree of suspicion should be present whenever we come across a non healing lesion in a patient with lichen planus. A few markers, which may give us a clue for increased chances of malignant transformation in these cases is presented. IntroductionLichen planus is a common papulo-squamous disorder affecting about 1-2% of the population. Lichen planus several forms. It can affect the oral mucosa, skin, nails and genatalia. Cutaneous lichen planus may affect any area but it is often seen on the front of the wrists, lower back, and ankles. Usually the lesions near the ankle are scaly and itchy and form the hypertrophic variant. New lesions occur when the old lesions are clearing. When the lesions cleared they are often replaced by greyish brown discolouration especially in dark skinned individuals. Usually these lesions heal with the conventional treatment. Neoplastic transformation in lichen planus has been described, especially in the oral form of the disease where an estimated 0.3-3% of patients may develop squamous cell carcinoma. Malignancy though uncommon with cutaneous lichen planus has been described in chronic hypertrophic lesions of lichen planus on the legs [3][4][5].