What type of tissue is involved in scar formation consisting of dense tissue?

Scar formation primarily involves a type of tissue known as keloid tissue. Keloids are raised areas of fibrous tissue that form at the site of an injury or incision due to an overproduction of collagen during the healing process. This dense tissue results from the body’s attempt to repair itself after the skin has been damaged, and the excess collagen leads to the characteristic appearance of a keloid.

Keloids typically extend beyond the original boundaries of the wound and can vary in size and shape. Unlike normal scars, which usually fade over time, keloids can remain prominent and may even grow more extensive than the original injury. Their formation reflects an intense healing response where fibrosis occurs, creating the dense connective tissue that characterizes keloid scars.

Other tissue types listed do not involve scar formation in the same manner. Ligaments are bands of dense connective tissue that connect bones to other bones, infarcts refer to areas of necrosis due to inadequate blood supply, and ischemia describes a deficiency in blood flow to an organ or tissue. None of these options relate specifically to the process or outcome of scar tissue formation like keloids do.