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Why might full-thickness lacerations cause more scarring than shallow lacerations?

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Close-up of a person holding a child's hand with scabs on the fingers, gently cleaning the wounds with gauze. — wound Injuries that break skin can be painfully memorable.

Full-thickness lacerations are more likely to cause significant scarring compared to shallow lacerations primarily because they involve deeper tissue damage, which complicates the natural healing process.1

When a laceration extends through the full thickness of the skin into subcutaneous tissues, muscles, or other underlying structures, the body’s repair response is more extensive. These deeper wounds are frequently associated with delayed healing, which increases the duration and intensity of the inflammatory and proliferative phases of wound repair. During these phases, fibroblasts produce collagen to bridge the gap in the tissue. Because full-thickness wounds are larger and deeper, they require a greater volume of collagen deposition to restore structural integrity, often resulting in more prominent scar tissue.123

Furthermore, full-thickness injuries are more prone to complications such as infection or the presence of foreign debris, both of which can disrupt normal healing and trigger an excessive, protracted inflammatory response that leads to increased scarring.142