A burn with skin dammage can be simulated in several ways.
Old school, use facial tissue and corn syurp. Paint the area with a thin wash of syrup (say about a 1/2 teasoon if your only covering a cheek or forehead) then gently apply one ply of the tissue, using tweezers. Pat the tissue into place; the syrup will hold and dry with the tissue. As it dries, using your fingers, press the tissue into scar ridges. This all cleans up with warm water and soap – if you don’t like the look, wash it off and go again.
Liquid latex is a more permanent solution; it will stay up longer and depending on the action, hold up for more takes. Apply with a brush over the area and if necessary, cover with makeup when dry – sometimes the color of the latex looks pretty close to dead or scarred skin sometimes it’s too white.
There are dozens of tutorials on-line, look in the area of “halloween makeup”. Many “halloween” effects companies (haunted house props and make-up) sell simple makeup kits for that type of effect, most with detail instructions included.
Remember to take photos of the subject, before and after, plus any detail photos – if you have to re-create/re-shoot, you’ll have a reference for continuity purposes.
Cheers,
Frank Otto
“Design is a process by which you create something for a client who has no idea of what they want until they see your design – then they know what they want, but your design isn’t it.”