Photo-allergy (ultraviolet sensitivity) Patient Information: 1. The best treatment for photosensitivity is to limit ultraviolet exposure (sunscreen) and to use high protection index sunscreens. 2. Wearing a wide-brimmed hat and long-sleeved clothing in the summer can provide a degree of protection. 3. Short periods of sun therapy can improve the body’s tolerance to ultraviolet light. However, strong sunlight should be avoided, without aggravating the original skin disease or disease remission period, can be daily in the morning (generally before 8:30) and afternoon after 17:00 appropriate sun exposure, according to the individual situation, but in the case of serious diseases, it is best to sunscreen. 4, the appropriate application of sunscreen. Research has found that mineral sunscreen on UVA and UVB have a protective effect, and was dose-dependent relationship. However, some people pointed out that the light protection index of 14 sunscreen in 88% of patients can not prevent the occurrence of rash. It should also be noted that the possibility of increased morbidity, so it is appropriate to combine with the patch test to choose the shade. 5, in addition, for users of sunscreen, the following recommendations can be referred to: (1) exposure to sunlight 15-30 min before the use of sunscreen in the exposed area; (2) sun exposure 15-30 min after the repeated use of sunscreen in the exposed area; (3) such as swimming, scrubbing, excessive sweating and friction, such as strenuous activities such as the repeated use of sunscreen is advisable. 6. Photodesensitization treatment should be carried out during the remission period or about 1 month before the annual flare-up or exacerbation of the disease in order to increase the tolerance to sunlight.