I would put lavender essential oil on it straight up or mixed with a little aloe gel.
I had a terrible burn on my neck and someone said to put it on as soon after the burn as possible. This burn should have been really bad and taken a long time to heal. I got the lavender EO on it within 1/2 hour of getting the burn and within minutes, the pain was almost gone, by the next day, the swelling and redness was greatly improved and by the next day, all that was left was the center blister which healed within a few days.
I swear Lavender EO is a miracle cure for burns.