Final answer:
Granulation tissue is the filler tissue that emerges during the skin healing process, leading to scar formation after an injury.
Step-by-step explanation:
The tissue that fills the gap in the skin during healing is called granulation tissue. Granulation tissue forms as part of the repair phase following an injury, where fibroblasts deposit collagen and extracellular materials to replace those that were lost. This process is accompanied by angiogenesis, resulting in the vascularization of the new tissue, while immune cells such as macrophages reduce the risk of infection. When the healing process is complete, this tissue often gives way to a pale scar if a significant amount of granulation tissue was formed and the capillaries receded.