Which of the following best describes friction wounds?

Friction wounds are characterized by damage to the skin that results from the dragging or rubbing of skin across a surface. This mechanism typically affects the epidermis and can extend into the dermis, resulting in partial thickness wounds. The term "shredded or denuded skin" accurately describes this type of injury, as it indicates that the outer layers of the skin have been mechanically removed or disrupted due to the force applied.

In contrast, the other descriptions do not accurately depict friction wounds. Full thickness wounds with deep tunneling are more characteristic of pressure ulcers or diabetic ulcers that go deeper into the tissue. Completely healed and flat wounds imply that there is no active injury remaining, which does not align with the concept of friction wounds as they are typically fresh injuries. Lastly, wounds with necrotic tissue indicate the presence of dead tissue rather than the dynamic process of friction leading to skin loss or damage, which typically presents with healthy or partially damaged tissue rather than necrosis.