Acne scars develop when inflammatory acne, particularly cystic and nodular lesions, penetrates deep into the dermis and damages the collagen network that gives skin its structure. When the body attempts to repair this damage, it can either produce too little collagen, resulting in atrophic depressions, or too much, resulting in raised hypertrophic scars.
According to the American Academy of Dermatology, early and consistent acne treatment is the most effective way to prevent scarring, because scars form during the wound-healing response to sustained inflammation. Once collagen has been lost or laid down disorganized, topical products alone cannot restore the original architecture.
Treatments that trigger controlled collagen remodeling, such as microneedling, work by creating microscopic channels in the skin that initiate a healing cascade. This process gradually rebuilds a healthier collagen matrix beneath the scar, softening its appearance over a series of sessions.
