Which of the following describes a Stage 2 pressure ulcer?

A Stage 2 pressure ulcer is characterized by partial thickness skin loss involving the epidermis, the dermis, or both. This means that some of the skin layers are damaged, and the ulcer presents as an open sore or a blister that may appear shallow and have a red or pink wound bed. The key point is that there is exposure of the dermis, but it does not extend into the deeper tissues like full thickness ulcers do.

The other choices describe different stages or types of skin injuries. Full thickness skin injury refers to a more severe ulcer where all layers of the skin have been damaged, typically associated with Stage 3 or Stage 4 pressure ulcers. Non-blanchable erythema indicates skin redness that does not change color when pressed, which signifies a Stage 1 pressure ulcer. Full-thickness tissue loss points to an advanced ulcer that affects deeper structures and correlates with later stages of pressure injury. Therefore, "partial thickness skin loss with exposed dermis" succinctly captures the essence of a Stage 2 pressure ulcer.