Which injury occurs from friction or pressure causing damage to underlying vessels?

The correct answer is a contusion, as it results from direct trauma to a muscle or soft tissue that causes bleeding beneath the skin. This bleeding occurs due to the rupture of small underlying blood vessels without an open wound. In a contusion, the friction or pressure from the impact leads to localized swelling and discoloration, indicating damage to the tissues. This is different from abrasions, which involve scraping away of the skin's surface and do not typically damage blood vessels in the same manner. Lacerations are characterized by a tear or cut in the skin and underlying tissues, often resulting from sharp objects. Avulsions involve a section of skin or tissue being forcibly detached, which also does not align with injury caused specifically by friction or pressure. Understanding these key differences helps clarify why a contusion is associated with friction or pressure damage to underlying vessels.