Whether or not a sunburn tan will heal on its own has to do with the severity of the sunburn. Generally speaking, mild sunburn can be self-healing, but serious sunburn needs to receive professional treatment to recover. 1. Mild sunburn: After being exposed to ultraviolet light for a long period of time, skin melanocytes proliferate actively and secrete more melanin particles, causing skin pigmentation and darkening, etc. As long as it takes a period of time to take care of it, it is generally possible for it to be self-healed. 2. Severe sunburn: If after a long time of ultraviolet radiation, the skin is not only black, flaking, but also erythema, blisters, vesicles and other serious sunburn reactions, the possibility of self-healing is reduced, triggering an increase in subsequent problems, the need for timely medical treatment, under the guidance of the doctor medication for treatment, to avoid large areas of the skin peeling and other situations. The skin is sunburned after the need for a longer recovery period, during this period, dietary adjustments should be made to reduce spicy, stimulating food intake, to light diet, eat more fresh fruits and vegetables. If you do not recover from sunburn for a long time, or if your skin reaction worsens after sunburn, it is recommended that you go to the dermatology department of the hospital for treatment immediately.