Reddened and painful sunburned skin is mainly due to solar dermatitis, which can be treated by cold compresses and topical medications. Need to choose the appropriate treatment according to the severity of the skin sun and so on. 1. Mild sunburn: If the sun is a slight redness and pain, you can use a cold towel to reduce the skin temperature, which helps to shrink the skin capillaries and relieve the pain. After the symptoms disappear, you can use topical Dinaid cream and Fludioxonil Vitamin B6 cream to prevent infection. 2. Severe sunburn: the skin is red and painful with burning or blisters from the sun, you can apply Furtarine ointment or Epidermal Growth Factor, etc. to promote the regeneration of damaged skin tissues under the advice of your doctor. Suffering from solar dermatitis may also lead to lupus erythematosus, dermatitis, skin cancer, etc. Go to the hospital and follow the doctor’s instructions for medication if necessary. When you go out in the summer, pay attention to sun protection, do not be outdoors for a long time in the sun.