Which type of nail condition involves lifting of the nail from the nail bed?

Onycholysis is the correct choice as it specifically refers to the condition where the nail separates or lifts away from the nail bed. This separation can be due to various factors, including trauma, fungal infections, or certain skin conditions. In onycholysis, the affected nails may appear discolored, often turning white, as they become detached from their underlying support.

The other conditions listed do not involve the lifting of the nail from the nail bed. Leukonychia refers to the appearance of white spots or lines on the nails, typically due to minor injuries to the nail matrix or other non-serious issues. Onychoschizia describes the splitting or peeling of the nail, particularly at the free edge, rather than lifting from the nail bed. Paronychia is an infection of the skin around the nail that can result in swelling, redness, and sometimes pus, but does not involve the nail itself lifting away. Understanding these definitions highlights why onycholysis is distinguished by its specific characteristic of nail lifting.