Poor girl. My son got burned from our front porch made of slates that has been baking in the sun all day. And it was a cool Oct. Weather too. They just gave him ointment. I felt bad and , of course it had to be reported (all burns have to, from what they told me but it doesn't mean there will be a follow up). But I had no problem proving them that the porch does get extremely hot. This time, I will not let any kids near it or sit on it until I check it first. I do not see any scars. He got burned a second time at 12 years old when he was help with cooking and got boiling water spilled on him. He got ointment again . Some areas was second degree burn and some third degree. He healed fine and we can't see any discolorations or anything.
The only experience I know is my grandfather. He accidentally got kerosene mixed up with gas and was badly burned. They had use some kind of pig skin but that was back then.