Abstract: Objective: To compare the dermoscopic features of classical lichen planus (LP) and lichen planus pigmentosus (LPP). Methods: Ninety-nine skin lesions of 13 patients with LP and and 6 patients with LPP were selected and examined with dermoscopy. The dermoscopic features between the two diseases were compared. Results: The dermoscopic features of classical LP were characterized by Wickham striae, yellow-brown pigmentation mainly in patches，as well as dotted and line vessels. The main features of LPP included gray-blue or yellow-brown pigmentation mainly in dots and globules as well as follicular keratotic plugging. Conclusion: Dermoscopy can be a valuable supplementary tool in the diagnosis of classical LP and LPP.

Key words: dermoscopy, lichen planus, lichen planus pigmentosus