What is a scar?
Scarring is the procedure by which wounds are repaired. Damage to the deeper layer of the skin, the dermis, is necessary to produce a scar. Damage to only the epidermis, the most superficial layer of skin, will not always produce a scar. Scars produce a structural change in the deeper layers of the skin which is perceived as an alteration in the architecture of the normal surface features. It is not just a change in skin color. Fetal tissues and mucosal tissues have the capability to heal without producing a scar. Understanding how and why this is possible could lead to better surgical scar outcomes.
A scar is a permanent textural change to the skin that is often associated with color and contour changes. Scars develop from an injury to the dermal and subcutaneous layers of the skin, whether from external trauma or inflammatory skin situation such as acne. Many types of scars can happen including keloidal and hypertrophic, which are often red and rose from the skin. Atrophic scars appear as a depression in the skin. Acne scars can be classified further by their appearance with each type of acne scar requiring a specific method of treatment.