What Causes a Red, Raised Scar After a Knee Scraping?

After a knee abrasion, it’s common to notice a raised, red mark developing at the site of injury. This is typically a hypertrophic scar—a benign, fibrous overgrowth of connective tissue that forms during wound healing. Unlike normal scars, which lie flat and gradually fade, hypertrophic scars remain confined to the original wound boundaries but become thickened, firm, and erythematous due to excessive collagen deposition and persistent inflammation in the dermis.

Hypertrophic scarring often emerges within weeks after skin trauma—especially in areas subject to frequent movement or tension, such as the knee joint. Factors contributing to its development include deeper abrasions, repeated mechanical stress on the healing tissue, infection, or delayed wound care. While visually prominent and sometimes mildly pruritic or tender, these scars are not malignant and do not invade surrounding healthy skin—distinguishing them from keloids, which extend beyond the wound margins.

Management focuses on early intervention: silicone gel sheets or ointments, gentle compression with adhesive bandages, and strict sun protection (as UV exposure can worsen pigmentation and delay remodeling). In persistent cases, intralesional corticosteroid injections or pulsed-dye laser therapy may be considered under dermatologic supervision. Most hypertrophic scars soften and flatten over 6–12 months with conservative measures, though individual outcomes vary based on age, skin type, and genetic predisposition.