Second degree burns can result with only brief exposure when your skin is sensitized by these drugs. Be sure to check with your doctor or pharmacist if you plan to be in the sun and are taking any medicine. The most immediate treatment for both thermal and chemical burns is to stop the burn from progressing. If done within the first minute or so, cold water emersion for up to 30 minutes can reduce both the total area involved and the depth of the burn. This prevents the delicate new skin underneath the burn from drying out, cracking, and peeling away with the burned skin layers on top of it.
Deeper burns require a lot more.
Make sure the area of all blistering burns is less than the size of your palm. If larger, see a doctor. The skin underneath the blister is actually healing while the blister protects it from further damage and infection. Once burst, remove the collapsed skin from the blister with gentle washing and sterile tweezers. The raw, weeping skin under the blister must be protected after the blister bursts.