Which of the following is NOT a type of open wound?

A contusion is not classified as an open wound; instead, it is a type of closed wound. Open wounds involve a break in the skin which can expose underlying tissues, potentially leading to infection.

In contrast, abrasions are characterized by the scraping away of the surface skin, lacerations are tears in the skin that may involve deeper tissues, and punctures are caused by sharp objects that penetrate the skin. Each of these types represents a breach in the skin integrity, thereby qualifying them as open wounds.

Understanding the distinctions among these wound types is crucial for proper assessment and treatment in first aid scenarios.