People with lupus erythematosus should not sunbathe because sunlight is an important triggering factor that initiates or exacerbates the development of lupus erythematosus. For skin with reduced pigmentation or with chronic discoidal damage, erythema, scaling, atrophy, pigmentary abnormalities, and scarring and alopecia are all chronic discoidal damage. Sun exposure increases the risk of skin cancer, and sun exposure can exacerbate systemic disease in patients with lupus erythematosus. It is very important for patients to protect themselves from the sun, waist to take protective measures, can apply sunscreen and umbrellas, a combination of protective measures. Sunscreen to apply high SPF sunscreen, preferably containing titanium dioxide or zinc oxide physical sunscreen. Strong sunlight or outdoor time to often reapply, 2 hours 1 time, each time the amount of such as the size of a dollar coin, coated evenly in the face. There are also wearing clothes to minimize the exposed parts, to prevent direct sunlight on the skin, induced disease. Noon time ultraviolet radiation in the spectrum of UVB is very strong, avoid outdoor activities at noon, UVA can penetrate the glass window, so sit by the window should also be sunscreen.