What Causes Acne Scars? The Science of Collagen Damage
Why do some pimples disappear without a trace while others leave permanent pits in your skin? We break down exactly what causes acne scars on a cellular level.
Almost everyone gets pimples, but not everyone gets permanent indentations left behind. It can feel deeply unfair when a breakout clears only to reveal a physical pit in your cheek. To understand how to treat them—or better yet, prevent them—you must first understand exactly what causes acne scars at a structural level.
The Root Cause: Severe Inflammation
Acne scars are the result of severe, deep-tissue inflammation. When a pore becomes completely blocked by a hardened plug of oil and dead skin, acne bacteria (*C. acnes*) multiply rapidly within that trapped, oxygen-free environment. Your immune system detects the massive infection and sends white blood cells to attack it.
This battle creates intense inflammation. If the pressure inside the pore becomes too great, the wall of the pore ruptures. The infection spills deep into the dermis (the lower layer of skin), destroying healthy tissue and, most importantly, destroying collagen fibers.
The Healing Process Gone Wrong
When the infection finally clears, the body attempts to repair the massive crater left in the dermis by laying down new collagen. Scars form when this repair process is imperfect:
- Atrophic Scars (Indented): These occur when the body produces too little collagen during the healing process. The skin physically sinks into the void left by the destroyed tissue. This results in ice pick scars (deep, narrow pits), boxcar scars (broad, rectangular depressions), and rolling scars (wavy texture).
- Hypertrophic Scars (Raised): Less common on the face but frequent on the chest and back, these occur when the body panics and produces too much collagen, resulting in a raised, firm bump of scar tissue.
The Popping Factor
While your genetics dictate how well your body produces collagen, your actions play a massive role. Picking, squeezing, or popping a deep cystic pimple forces the infection deeper into the dermis, guaranteeing a massive rupture of the pore wall and almost certainly causing permanent collagen destruction.
Summary
What causes acne scars? At its core, it is the destruction of dermal collagen caused by deep, severe inflammation. The only way to truly prevent indented scars is to treat cystic acne aggressively with topical or oral medications before the infection has a chance to rupture deep within the skin.
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