Scarring occurs during wound healing when the body attempts to restore the skin‘s protective function. Since scar tissue is usually firmer and lighter in colour than the surrounding skin, scars are apparent and thus often perceived as an aesthetic disturbance.
We distinguish between atrophic scars, where contraction pulls the skin inward (e.g. in acne) and hypertrophic scars, where the skin bulges outward and is often reddish in colour.
Scars with excessive connective tissue growth are called keloids. Apart from being an aesthetic problem, scars may cause itching and – particularly near joints – a sensation of tightness.