After trauma or surgery, certain scars can form, notably hypertrophic scars and keloids. Hypertrophic scars emerge from wounds like trauma, surgery, or acne, taking more than 3 weeks to heal; they are raised and localized to the wound area, usually resolving on their own but often requiring medical attention. Keloids, stemming from the Greek "cheloides" meaning crab claw, result from an excessive healing response, often hereditary, seen on bony prominences like chest, shoulders, and ears. They extend beyond wound borders, potentially causing itching or burning, and respond better to early treatment.