Narrow-wave ultraviolet (NB-UVB) irradiation therapy A long time ago, the people realized that sunlight has a therapeutic effect on many skin diseases, and thus sunbathing has long been one of the fitness projects, ultraviolet phototherapy has been used in medicine to treat a variety of skin diseases for more than one hundred years of history. Its therapeutic mechanism is mainly photo-immunity, that is, the body’s biological molecules absorb ultraviolet light to produce photochemical reactions, transforming the biological properties of the skin, resulting in therapeutic effects of narrow-spectrum ultraviolet light purchased by the Department of effective treatment of a variety of skin diseases. 1, what is narrow-spectrum medium-wave ultraviolet light: the Department of wavelength 310 ~ 315nm, the peak wavelength of 311nm ultraviolet light, is this year’s research has proved that the efficacy of the ultraviolet light is very good, side effects of the smallest, is the past has been used for the treatment of long-wave ultraviolet (UVA) and broadband ultraviolet medium-wave (UVB) of the newer generation of light therapy. In the treatment does not need to take or external photosensitizer, irradiation time, not easy to produce side effects, simple and convenient, easy to accept the advantages of patients. 2, narrow-wave ultraviolet irradiation indications: psoriasis, vitiligo, pityriasis rosea, atopic dermatitis, eczema, neurodermatitis, seborrheic dermatitis, psoriasis, palmoplantar pustulosis, itching, etc., with the effect of the drug is difficult to achieve. 3, irradiation method: general every other day irradiation, different kinds of diseases, irradiation of the number of times more or less different, should follow the doctor’s guidance, do not casually interrupt the treatment.