What type of injury involves pus and loss of skin depth?

The type of injury that involves pus and loss of skin depth is an ulcer. Ulcers are characterized by tissue breakdown that results in an open sore or lesion on the skin or mucous membranes. This not only leads to a loss of skin depth but can also be accompanied by infections, which result in the presence of pus.

An ulcer typically forms due to various reasons, such as prolonged pressure on the skin, infections, or poor blood flow, making it different from other types of injuries, which may not necessarily involve pus or significant skin depth loss. Understanding the nature of an ulcer's formation and its symptoms is crucial for diagnosis and appropriate treatment in the field of cosmetology and skin care.