What is the general medical term for a skin injury that results in bleeding from capillaries?

The correct choice refers to ecchymosis, which is defined as a type of skin injury where bleeding occurs under the skin, leading to a discoloration that typically appears as a bruise. This process involves blood leaking from capillaries into the surrounding tissue, creating the characteristic purple, blue, or black marking.

Ecchymosis is specifically associated with the rupture of small blood vessels, known as capillaries, which differentiates it from other types of skin injuries. The other terms describe different forms of skin trauma but do not specifically denote bleeding from capillaries. A laceration involves a tear or cut in the skin, an abrasion is a superficial injury that scrapes away the skin's surface, and a wheal-and-flare reaction is a temporary localized swelling and redness often seen in allergic reactions. Thus, ecchymosis distinctly signifies the bleeding phenomenon under the skin more accurately than the other terms listed.