Please choose the correct ending to complete the given sentence: Health: [header] How to treat a blister burn [title] Run cool water over the blister. [step] The first thing you can do to treat a blister burn is to run cool or lukewarm water over the affected area. You can also use a cool bath or press a towel soaked in cool water on the burn.

Ending1: This will help move the sting further and reduce the swelling. [substeps] You can submerge a towel in cool water and gently rub the burn area until it has cooled. Ending2: Allow the area to cool down for at least 20 minutes so you can remove the bandage. [substeps] You may want to untape the bandage to ensure you do not pull the needle out while you are running water over it. Ending3: Keep the affected area in the cool water for 10 to 15 minutes. [substeps] Make sure you are using cool water and not cold or ice water. Ending4: [substeps] You can also cool your skin by soaking the affected area in cold water (however, if it is cold, the ice will offer the most relief). [title] Use a heat pack on the burn.

Answer format: ending1/ending2/ending3/ending4