Final answer:
A lesion following the healing of an injury is known as a scar, which is formed when fibroblasts deposit collagen as part of the tissue repair process. Overproduction of collagen can lead to keloids, and scars may vary in appearance based on the nature of the injury and the body's healing response.
Step-by-step explanation:
The lesion found following the healing of an injury is typically called a scar. During the healing process, various stages occur such as clotting to reduce blood loss, the formation of scabs, the accumulation of pus, and eventually the regeneration of tissue. Fibroblasts deposit collagen, leading to the formation of granulation tissue which is rich in blood vessels. As the healing progresses and the granulation tissue matures, it results in scar formation when the skin fails to regenerate the original structure. In certain cases, where collagen production is excessive, a raised scar known as a keloid may form, whereas scars with a sunken appearance, such as those resulting from acne or chickenpox, are referred to as atrophic scars.
After an injury, tissue repair includes blood clotting and regeneration of tissue. Some tissues, like epithelial and connective tissues, regenerate well, while others, like muscle and nervous tissue, may not repair as effectively or at all. Various factors can influence the outcome of a wound's healing, including the wound's size, depth, and the body's response to the injury. When large wounds are present, sutures may be used to promote a primary union and minimize the appearance of scars. The end result of the healing process, which may involve skin grafting in severe cases, is the formation of a scar that is made up of collagen but lacks the original cellular structure of the skin, including hair follicles, sweat glands, or sebaceous glands.