A pressure dressing is most commonly applied over which of the following?

A pressure dressing is predominantly applied over a skin graft to promote optimal healing and to minimize the risk of complications. When a skin graft is performed, the newly applied graft is vulnerable to dislodgement and hematoma formation, which can negatively impact the graft's ability to adhere and receive proper blood supply.

Applying a pressure dressing helps to secure the graft in place firmly while also applying pressure to reduce the formation of blood between the graft and the recipient site. This not only aids in healing but also reduces the chances of graft failure due to shifting or accumulation of fluids.

In contrast, while pressure dressings can technically be applied in other surgical contexts, the primary purpose and the effectiveness are most critical and beneficial in the case of skin graft procedures. Other options listed may involve dressings, but they do not emphasize the need for a pressure dressing in the same way as skin grafts do, where the graft's integrity and success are highly reliant on maintaining contact with the underlying tissue and preventing fluid accumulation.