Abstract: Su Ting, Chen Yiwen, Sun Yaqi, Zhang Meihua, Su Zhonglan Department of Dermatology, Jiangsu Province Hospital, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China Corresponding author: Su Zhonglan, Email: susustyle1990@163.com 【Abstract】 Objective To investigate clinical and histopathological features of lichen planopilaris（LPP）. Methods The clinical and histopathological findings in 3 cases of LPP were analyzed. Results All the 3 patients were female, and their average age was 49 years. One patient presented with large-area patchy hair loss on the frontal, parietal and occipital region, and 2 patients presented with irregular patchy hair loss on the scalp and skin atrophy. Besides the hair loss, the eyebrows and axillary hairs also lost in 1 patient. Histopathological examination showed liquefaction degeneration of basal cells in the walls of hair follicles and infiltration of lymphocytes. Infiltration of a small number of lymphocytes was also observed around blood vessels and appendages. Conclusions LPP may only affect the scalp, or involve the other sites all over the body. LPP commonly manifests as patchy hair loss on the scalp and skin atrophy, and is pathologically characterized by liquefaction degeneration of basal cells in hair follicles and infiltration of lymphocytes.

Key words: Lichen planus, Hair, Hair follicle, Alopecia