Sunburn is generally due to sun exposure caused by thermal burns, mild sunburn recovery period of 3-5 days, moderate to severe sunburn recovery period of 10 days or more, due to individual skin metabolism rate is different, so the length of the recovery time is different. 1. Mild sunburn: there will be bright red patches on the skin surface, the recovery time is about 3-5 weeks, you can relieve the pain and itching discomfort by applying cold compresses. 2. Moderate to severe sunburn: the skin surface will appear red, swollen and even blisters, at this time you need to strictly protect the trauma, smaller blisters recommended to let it self-absorption, slightly larger blisters recommended to regular medical institutions to ask specialists for trauma treatment; can be used at the same time, growth factors, mupirocin ointment, etc. to promote the repair of trauma, prevention of infection. Once the skin is sunburned, in order to avoid causing other skin inflammation, it is recommended to go to a professional skin hospital for treatment. At the same time, pay attention to the protection of wounds, avoid mechanical friction and strict sunscreen, so as not to lead to hyperpigmentation, infection and other adverse consequences.