Ota (open to air) is actually really common wound care advice. Wound care nursing is a pretty big specialty (like it requires a master’s and extra school) and most of the time they roll up on the unit and tell the patient to gently wash it then stop touching it. They tell me it’s not worth it to dress a lot of wounds because it actually traps bacteria. Honestly the part of this I find less believable is that a full thickness burn on the hand of all places would have to be super tiny like smaller than a pencil eraser to not get a plastic surgeon involved.