If it doesn't heal: A 3rd-degree, or full-thickness, burn is all the way through the skin and will require operative closure, usually a skin graft. A 2nd-degree burn is only partway through the skin and will heal on its own in 1 to 3 weeks with good wound care and good nutrition. Therefore, a burn that isn't healed after 3 weeks is probably 3rd-degree in depth.
Answered 5/24/2013
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