Objective To investigate the efficacy of poly (L-lactic acid) application in the rejuvenation of hands, and to analyzethe safety of its application. Methods two subjects with aging problems of the hands were given subcutaneous injections of poly-L-lactic
Fotona 4D pro（欧洲之星）激光治疗仪根据选择性光热作用理论，将Nd∶YAG和Er∶YAG两种不同组织选择性的激光协同，辅以4种专利治疗模式，在一次治疗中同时对皮肤浅、中、深层产生治疗作用，促进色斑淡化、刺激胶原再生，从而达到皮肤年轻化目的。聚左旋乳酸（poly L-lactic acid，PLLA）是一种胶原蛋白刺激剂，与传统即刻见效的产品不同，其通过刺激局部成纤维细胞，缓慢生成胶原蛋白，可逐渐改善皮肤纹理、收紧皮肤或增加体积[2，3]。
At week 24, mean improvement in WSRS from baseline was 2.09 0.68 for the PLA side and 1.54 0.65 for the HA side. Both injections were well toler- ated, and the adverse reactions were mild and transient in most cases. PLA provides noninferior efficac