1.Keep an optimistic state of mind and build up strong confidence. 2.Avoid sun exposure and photosensitive drugs, such as phenothiazine, hydrochlorothiazide, sulfonamides and ashwagandha. 3.Avoid exertion. 4.Avoid cold, flu or other infections. 5.Enhance the body resistance, pay attention to nutrition and vitamin supplementation. 6, pregnancy precautions: the first 3 months of pregnancy is prone to miscarriage, should adhere to the medication, avoid trauma and trauma. The second 3 months of pregnancy and after delivery are prone to aggravation (about 50%), and the condition should be closely monitored.