It's good. Zhang Zhiyuan Yahang is the director of dermatology at Huashan Hospital. He has many years of experience in clinical diagnosis and treatment of dermatology. He studied in the dermatology department of Henan Provincial People's Hospital. He is good at treating all kinds of dermatology diseases with integrated traditional Chinese and western medicine, constantly learning and mastering the latest dermatology diagnosis and treatment technologies and concepts, and providing patients with more advanced and effective treatment schemes. To sum up, Zhang Zhiyuan Yahang is an experienced, skilled and rigorous dermatologist with a high level and reputation in the field of dermatological diagnosis and treatment.