The third injection of the new crown vaccine will not cause baldness, mainly due to their own reasons, need to consult a doctor for timely treatment. The main components of the vaccine are inactivated New Crown virus, recombinant protein, etc. After entering the human body, the vaccine mainly works on the immune system, producing antibodies to achieve the preventive effect. It will not affect the skin and hair, and will not cause baldness. Therefore, the emergence of baldness mainly consider their own reasons, such as heredity, mental stress, infection with herpes zoster virus, vitiligo and so on, can lead to the emergence of baldness. Therefore, it is recommended to seek medical treatment in time, and carry out relevant examinations and treatments under the guidance of doctors, so as to control the progress of the disease and symptoms in time.