This is a widely recognized therapy, and ultraviolet light therapy is an important component of dermatology because phototherapy does have an effect on the condition of vitiligo patients, not only because of its effectiveness, but also because ultraviolet phototherapy is economical, has a relatively short effective treatment time, and is less prone to side effects.

The ultraviolet phototherapy device uses narrow spectrum medium wave ultraviolet light waves UVB, which concentrates the most biologically active part of ultraviolet light and directly acts on the affected area of the skin. 

What are the benefits of UV light to the human body?A: There are many benefits of UV radiation to the human body: for example,UV radiation can induce the production of vitamin D, promote local blood circulation, accelerate wound healing, and have sterilization, pain relief and other effects;