[Development of squamous epithelial carcinoma on the lower leg in long-term verrucous lichen planus].

Lichen ruber planus and squamous cell carcinoma are common diseases of the skin. Several publications have dealt with the association between these two types of dermatosis. Extensive trials have shown the potentially premalignant nature of lichen planus of the oral mucosa. However, no study conducted so far was able to show that lichen planus of the skin increases the risk for squamous cell carcinoma. We report a 65-year-old man who developed a squamous cell carcinoma in a long standing verrucous lichen planus in the lower leg.