This drug is a therapeutic drug used when skin and other tissues are chronically damaged and our self-repair is not smooth. It can be used in surgery, gynecology, otolaryngology, ophthalmology, burns, plastic surgery and, of course, our dermatology. 2. When the therapeutic purpose is achieved, you can stop taking the medicine, so you can't simply say how to use it for a long time. It depends on the doctor's treatment needs and the speed of tissue repair. 3. It is a small molecular polypeptide with biological activity synthesized by gene recombination technology, and has no side effects as we usually say. This is your misunderstanding. It is to repair tissue damage rather than "stratum corneum". The stratum corneum does not need drugs to help repair, and our skin itself has a complete repair ability.