1Chinese expert consensus on scalp anti-agingGuidelines and consensus321-3252Study on the relationship between polymorphism of angiotensin converting enzyme gene and patients with psoriasis vulgaris with the induced factors of hair-dyeingHU Su-juan, HUANG You-guang, YANG JunOriginal articles326-328,3323Study on the preparation and in vitro transdermal penetration of epigallocatechin-3-gallate binary ethosomesSONG Juan, LV Zhi-cheng, WANG DongOriginal articles329-3324Study on SASH1 genetic mutations in 3 patients of generalized lentiginosisZHANG Tian-jiao, YANG Xiu-min, WEI Ai-huaOriginal articles333-3365Linear psoriasis: one case report and literature reviewLIN Min, LU Yong-hongClinical studies337-3406A study on the quality of life of the officers and soldiers with skin diseases stationed in XinjiangGUO Jun-kai, LI Yong-ping, YOU YiClinical studies341-3437Analysis of patients with HIV infection and the complicating central nervous system diseases in a general hospital in BeijingCHEN Ning, CAO Kai-na, ZUO YaClinical studies344-3478Application of deep learning in skin image recognitionTAN Hong, BA Wei, LI Cheng-xinReviews348-3519The progress in application of hyaluronic acid for injectionLIU Lan-ting, WU Lin, ZENG Dai-linReviews352-35510Research progress of clear cell hidradenomaJIANG Xin, WU Xue-you, DOU Jia-chenReviews356-35811Acne vulgaris and metabolic syndromeAN Yu-xi, CONG LinReviews359-36212Clinical study of facial rejuvenation carried out by picosecond laserLI Man, LIANG Chun-xia, LIAN ShiLaser and photon technique363-36613Application of continuous nursing intervention in the patients with chloasma treated by Q1064 nm laserDermatosis nursing care367-36814A case of Merkel cell carcinoma on the lower limbXU Yuan-yuan, WEI Xuan-jin, BA WeiCase reports369-370,37315A case of generalized juvenile xanthogranulomaQIN Bei, LIU Xin-xin, GUAN Zhi-weiCase reports371-37316A case of cutaneous undifferentiated pleomorphic sarcomaLIU Yang-ai, DONG Zheng-bang, WANG FeiCase reports374-37617A case of apocrine hidrocystomaDU Juan, LIU Ling-hua, TONG Wu-huaCase reports377-37818Primary cutaneous extranodal nasal type NK/T cell lymphoma: a case reportHU YAN Zhuo-ya, GAO Hong-bian, LI Suo-niCase reports379-38219A case of acquired trichorrhexis nodosaLI Bo, YAO Xue-yan, ZHANG Jian-zhongCase reports383-38420A case of bullous systemic lupus erythematosus presented with annular erythema and blistersZHAI Zhi-fang, ZHOU Cun-jian, ZHANG LianCase reports382-384 