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The NB-UVB therapy device is an uv phototherapy device with a wavelength between 311 and 312 nm. It is divided into whole body and local instruments. The whole body machine is suitable for use in hospitals. The treatment time is very short and very convenient. Partial machines now have a home version that can be purchased at home for added convenience. NB-UVB can treat a variety of diseases such as psoriasis, vitiligo, pityriasis rosea, pruritus, eczema, etc. In order to achieve better results and reduce side effects, please note the following considerations:

      1. Try to avoid photosensitizing drugs and food during the light period, and block your eyes when illuminated.

      2. Do not use any ointment or skin care products before the skin shines, so that the skin can fully contact with light and reduce the barrier to penetration. Psoriasis patients have some thick scales. After washing, gently remove the outer scales. It is better to not damage the inner skin, which can improve the curative effect.

      3. The frequency of light irradiation is generally 2~3 times a week. When the skin lesions are serious, the frequency can be increased to improve the curative effect. When the skin lesions are gradually improved, the frequency can be gradually reduced. At least 7-10 days, the irradiation is 10 times. A course of treatment usually takes about 3 courses. After a slight improvement, the irradiation can be stopped. If the photo is not improved 30 times, it can be rested for one month and then repeated.

     4. After each illuminating, the skin may have red, itchy, painful skin reactions. The dose, frequency and topical emollient can be adjusted to reduce adverse reactions. During the illuminating period, the skin can avoid other light exposure. In summer, long-sleeved trousers can be worn. To block.

     Phototherapy has small side effects and good curative effect. It has been widely quoted in clinical practice, but it also has contraindications and adverse reactions. Short-term adverse reactions include erythema, itching, dry skin, pigmentation, etc. These can be avoided and improved; in theory Long-term adverse reactions include photoaging, cataracts, skin cancer, and malignant melanoma. However, according to research at home and abroad, there is no clear evidence of an increase in human skin cancer after NB-UVB irradiation. Therefore, NB-UVB is safe and effective.