Narrow-spectrum UVB dermatology treatment instrument, which has been strictly verified by dermatology hospitals in many countries around the world, is safe, reliable and effective in the treatment of psoriasis, vitiligo, eczema, atopic dermatitis and many other skin stubborn diseases, and is currently adopted and promoted in Europe and the United States, and has gained high treatment evaluation internationally. Narrow-spectrum UVB is a new treatment technology for psoriasis, vitiligo and other chronic diseases. By irradiating the skin lesions with a certain wavelength of ultraviolet light, it produces a photochemical reaction or regulates the immune response and other effects, so as to achieve the purpose of treating certain stubborn skin diseases. Indications】: psoriasis, vitiligo, chronic eczema, atopic dermatitis, herpes zoster, pityriasis rosea, severe seborrheic dermatitis, dermatitis, palmoplantar pustulosis, baldness, paronychia, chronic skin ulcers, mycosis fungoides, various photodermatoses, etc. Clinical effects in Europe and the United States and other countries have shown high overall efficiency.