Question: Doctor, I am a lupus patient and I have heard that I should avoid the light for this disease, but I seem to be fine with sun exposure over the years, can I still do outdoor activities in the future? Answer: Hello, as a lupus patient, photosensitivity is a clinical manifestation of lupus patients, mainly because ultraviolet radiation from sunlight causes DNA genetic mutations in the skin and the formation of thymine dimers. While eliminating this so-called “foreign body”, it can also cause damage to one’s own tissues, such as pteroidal erythema, discoid erythema, kidney damage, etc. In addition, it can cause aggravation or relapse of the disease in lupus patients. Although photosensitivity is a clinical manifestation in lupus patients, with a clinical occurrence rate of 80% to 90%, there are still 10% to 20% of lupus patients without photosensitivity. In principle, patients with photosensitivity should not be exposed to direct sunlight for more than 15 minutes a day. The health of 80%-90% of lupus patients should not be affected by the low chance of 10%-20% not having photosensitivity. Individual patients are a different story. This chance is a statistical category and is not individualized. Based on these principles, you decide to organize your own lifestyle habits.