Walter, from experiance it will take a few years for that scar to go away. It will leave a collored mark.
Been there, done that and still touching them.
Do a lot of classic motorbikes, Adjusting & sinchronising carbs sometimes is a real pain.. especialy when my fore arm touches that bloody pipe while my hand is reaching for that tiny screw somewhere between that framework.. Welding gloves and tiny tools didn't work toghether.
I always carry toothpaste (the cheapest) to cover up those battle scars.
The enzymes in the toothpaste takes the burning pain away and makes it heal faster.
You first hear the hissing of your skin touching that hot spot. Then there's the smell of burned skin inmediatly followed by that stinging pain... followed by some "words", walking inside, Silendly looking at the wife, cooling it down with water and grabbing the tooth paste..