What condition indicates a detachment of the nail from the nail bed?

Onycholysis is the correct term that describes the condition in which the nail detaches from the nail bed. This condition can result from various factors such as trauma, infection, or underlying health issues. When the nail lifts away from the nail bed, it can lead to discomfort and an increased risk of infection, as the space between the nail and nail bed can become a breeding ground for bacteria and fungi.

In contrast, a cyst refers to a fluid-filled sac that can develop in various body tissues but is not related to nail detachment. The lunula is the visible part of the nail matrix at the base of the nail and does not pertain to nail bed issues. The term "Stage 2" does not specifically describe any nail-related condition but may refer to stages of various diseases or injuries, which further distinguishes it from onycholysis. Understanding these terms helps clarify the nature of nail conditions and their implications for treatment and care.