The screen will flash red when this happens, and the player can treat this in the First Aid menu.
Condition will be slightly decreased if the player picks up a burn. But far more dangerously, the player's maximum condition will be set at 75%, and will not recover past this point, until the burns are treated (although if Condition was higher, it will remain higher unless it's reduced by other sources).
To treat a burn, the player must use a Bandage and either two Painkillers or a cup of Rose Hip Tea at which point, the burns will be immediately gone. An Old Man's Beard Wound Dressing will not work on a burn. Burns will go away on their own eventually, but there is no rest prompt or set amount of elapsed time until it happens.