Acne scarring can manifest with either raised or depressed scars. Each type is caused by different circumstances. When your body begins to patch up the affected area by creating Collagen fibrous tissue, it can literally go into overdrive, called hypertrophy, and produces too much Collagen in response to the damaged tissue. The fibers pile on top of each other, resulting in a raised mass of new skin tissue. The new tissues are often called keloids and are most commonly located on the chest, back and shoulders.
If an insufficient amount of Collagen fibers are created to heal the skin, it can result in depressed scars. These can appear as tiny “dents,” rippling or “ice pick scars” across the affected area. These are far more common than keloids and affect the face more frequently.