Depth of skin injury: Superficial (formerly 1st-degree burns): Involving the epidermis only Partial-thickness (formerly 2nd-degree burns): Extending into the dermis Full-thickness (formerly 3rd-degree burns): Destroying the entire skin Estimate the size of burn, expressed as percentage of total body surface area of partial-thickness and full-thickness burns (see figure [A] Rule of nines [for adults] and [B] Lund-Browder chart [for children]).