What type of scar tissue extends beyond the original injury into normal tissue?

A keloid scar is characterized by its growth beyond the boundaries of the original injury into surrounding healthy tissue. This type of scar results from an overproduction of collagen during the healing process, which can lead to a thick, raised, and often discolored appearance. Keloids can vary in size and shape, and they may continue to grow over time, becoming more prominent than the original wound.

The formation of keloids is typically influenced by factors such as genetics, skin type, and the location of the injury. They can occur following surgical incisions, trauma, or even minor skin injuries. Unlike hypertrophic scars, which remain confined to the area of the wound and may flatten out over time, keloids do not regress and often require medical intervention for management.

In summary, the distinctive characteristic of a keloid scar is its tendency to extend beyond the original injury site into normal tissue, making it a unique type of scar tissue with specific implications for treatment and management.