Scars

Close inspection of acne skin can reveal some scarring in up to 90% of individuals . But significant scarring occurs in 22%. Scars may show increased collagen or be associated with loss of collagen
Types scars
Macular-(Flat): Hyperpigmented tiny flat scars. They are more common in darker skinned patients and in those who pick their lesions (acne excoriee).
Depressed(Ice pick): These are sharp, deep, depressed scars, wider at the surface and narrow at the base. -Rolling: These are distensible, depressed scars with gentle sloping edges. -Boxcar: These are shallow or deep, punched out scars, wide at the surface and the base.
Elevated(Hypertrophic): These are elevated, fibrotic scars, more common in males and frequently seen in the mandibular area of the face and back. -Keloidal: These are keloids developing in acne lesions. They are seen more often in males, on the back and chest. -Papular: These scars are raised, papular and fibrotic, most commonly seen on the chin and nose. -Bridging scars and sinus tracts: These are multiple linear scars, joined together by epithelial tracts containing foul-smelling products of sebum.