It is possible to take care of sunburn yourself if the burn is superficial first or second degree. First of all, cool the burned area with tap water (between 15 ° C and 25 ° C), about 15 minutes, until the pain is completely gone, or take a lukewarm, not cold bath if the burned area is extensive.
In the event of a first degree burn, apply in thick layers a calming and moisturizing ointment (type Biafine®). It will allow better healing.
For superficial second degree burns, extra care should be taken to avoid infection. So, clean the burnt areas with soap, with a dermal antiseptic.
Finally, in general:
Cover yourself to avoid any contact between the skin and the outside; Drink plenty to hydrate yourself (and hydrate your skin); Monitor your temperature; In case of headaches, take a pain reliever.
Medical advice may be needed if your sunburn covers more than 10% of your total body surface. Or if the blisters are more than 3 centimeters in diameter, if they affect sensitive areas (hands, genitals), if there are signs of infection of the skin (increased redness, pain, swelling or presence of pus), if you have a headache with confusion, weakness or dizziness, or if you have eye pain and cannot stand the light.
Source: Destination Santé