For UVB UV lamp instructions, there are generally dose reference tables and so on, but we can not always read, and different parts of the body lesions on the UV tolerance is not the same, so tell you a simple and easy way. 1, the first time you use UVB, first with a low dose (you can use time to control), you can start with 20 seconds each time, once a day. For three consecutive days, the local lesions have not changed significantly, you can add to 30 seconds, and so on, when added to a certain dose of irradiation 3 days later, the lesions are red, this dose and can be confirmed as the minimum treatment dose, and then based on this dose every other day, keep the local lesions slightly pink, when irradiated with this dose for a period of time, the local lesions pink color gradually reduced, you can add another dose, such as adding 10 seconds time, etc. Keep the local lesions are always pink. 2, different parts of the skin lesions on the UVB tolerance is different, so each part of the skin lesion treatment dose may be different, for example, the trunk flexural skin lesions initially irradiation 30 seconds may be red discomfort, but the same patient’s hand lesions irradiation 2 minutes may not change; the same patient’s left hip lesions 30 seconds red, while the right 30 seconds may not have a reaction, so we should be the minimum of each skin lesion Treatment dose to try to figure out, and write down. 3, in UVB irradiation must protect the eyes, because the eye base also contains pigment cells, UV radiation will cause vision loss, you can generally wear eyes can. 4, for some special parts recommended best not to irradiate, such as vulva, female breast, etc.. 5, because UVB irradiation can cause normal melanocyte function active, produce more melanin particles, and make the skin color black, it is recommended that we can protect the skin around the lesion before taking UVB, you can cut a hole in the clothing or cloth (require the edge of the hole than the edge of the lesion is 0.5cm). Every time you take the light, change the clothes with the hole or cover it with a cloth with a hole. Once the normal skin is covered with cloth or clothes, it must be covered each time in the future treatment to avoid causing surrounding normal skin irradiation injury. 6, once the local lesions are red and swollen by UVB irradiation, do not be nervous. You can use topical hormonal ointment to reduce the symptoms, and if you get a large bubble, you can disinfect the bubble and release the liquid. If you are not very sure about yourself you can find your competent doctor and ask him to help you deal with it. 7, for the developmental stage of vitiligo is generally recommended to apply UVB cautiously, or under the guidance of your competent doctor.