ACNE SCAR the fibrous tissue that replaces normal

ACNE SCAR the fibrous tissue that replaces normal Scar is defined as the fibrous tissue that replaces normal tissue destroyed by injury or disease . Causes of acne scar: formation can be broadly categorized as either the result of increased tissue formation or, more commonly, loss or damage of local tissue. clinical classifications: Acne scars are classified into three basic types depending on width, depth, and 3-dimensional architecture: •• Ice pick scars: narrow (diameter 2 mm), deep, sharply marginalized and depressed tracks that extend vertically tothe deep dermis or subcutaneous tissue Boxcar scars: round to oval depressions with sharply demarcated vertical edges. They are wider at the surface than ice pick scars and do not taper to a point at the base. These scars may be shallow (0.1–0.5 mm) or deep (≥ 0.5 mm) and the diameter may vary from 1.5 to 4.0 mm.