Under normal circumstances, redness from sunburn usually takes about a week to recover, or half a month or more for severe cases, depending on the individual. When the skin is sunburned, it is necessary to repair a certain amount of time, usually about a week, serious cases need half a month or even more, the specific time needed to repair due to the individual’s physique and metabolic rate and there are large differences, in addition, the recovery time is also related to the repair measures taken after the sun. In the redness after the sun, you can consider taking the following measures to accelerate the relief of skin inflammation and repair. 1. Cold compress: Saline can be used to clean and cold compress the sunburned area; 2. Repair: you can consult a doctor to prescribe some ointment to apply such as growth factors, mometasone furoate cream and so on; 3. Pay attention to sunscreen: you can apply sunscreen or wear sunscreen clothing to protect the skin when traveling, preventing the skin from being further sunburned. Redness of sunburned skin need to consult a doctor in a timely manner, and follow the doctor’s instructions to standardize the treatment.