It is recommended to buy it in the hospital pharmacy, but it is usually not sold to the outside world. You need to register at the hospital and then go to the dermatology department, and let the doctor prescribe the medicine before buying it. The price will be a little more expensive, but the quality is good and Absolutely authentic. Medical masks can be purchased in regular cosmetics stores, pharmacies, and hospitals. Medical masks are medical devices and are used after hospitals and beauty institutions have completed some medical beauty projects, or as auxiliary treatments for people with skin conditions.