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Guide to Acne Scar Types and Classifications

Acne scars are common skin concerns that can linger long after the breakouts have healed. These scars result from inflamed blemishes that damage the skin tissue, leaving visible marks. Acne scars vary in appearance, severity, and treatment approach, and understanding their types is essential for choosing the right treatment.

Different acne scars affect people in unique ways. Whether the scars are deep and narrow or shallow and discolored, identifying their type can help you determine effective options for minimizing them. Let’s explore the various classifications of acne scars and how to manage them successfully.

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“For successful treatment, it is important to analyze the skin and know the acne scars to choose the most effective treatment”

Types of Acne Scars

Here’s an overview of what you might expect with each scar type:

  1. Ice Pick Scars: Small but deep, these scars resemble tiny punctures, giving the skin a pitted look. They may take longer to heal and typically require advanced treatments like microneedling or chemical peels.
  2. Boxcar Scars: Broad depressions with well-defined edges, these scars often occur on the cheeks and jawline. While shallow boxcar scars may respond well to laser resurfacing, deeper ones need more intensive treatments.
  3. Rolling Scars: These scars create wave-like patterns across the skin, caused by fibrous bands pulling the surface down. Subcision or dermal fillers are often used to smooth out these scars.
  4. Hypertrophic and Keloid Scars: Raised, firm scars caused by excessive collagen production. They are more common on the chest, back, and shoulders and often require steroid injections or laser therapy.
  5. Post-Inflammatory Hyperpigmentation (PIH): These are flat, discolored spots left behind after acne, typically fading over time but treatable with chemical peels or topical treatments.

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Acne Scars Types

Infographic

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Before subcision treatment for deep acne scars after subcision treatment for deep acne scars

Move the slider to see the difference after the treatment. 

Before fractional laser resurfacing After fractional laser resurfacing

To browse more pictures, please visit our results page.

Video that Explains the Difference Between Lesions

When treating acne scars, the process begins with an in-depth consultation to assess the scar type. For deeper scars like ice pick or boxcar, microneedling or fractional laser resurfacing might be recommended. A numbing cream is usually applied to ensure comfort. During microneedling, fine needles create tiny punctures in the skin to stimulate collagen production. For rolling scars, subcision is performed to release the scar tissue tethering the skin, followed by the application of fillers for smoother results.

Patients may experience mild swelling or redness immediately after the procedure, which usually subsides within a day or two. Final results become noticeable after several sessions, spaced 4-6 weeks apart, for optimal skin rejuvenation.

Preparation and Aftercare Timeline

3 to 7 Days Before Treatment: Preparation
  • Avoid sun exposure and tanning beds.
  • Stop using retinol or exfoliating acids to reduce irritation risks.
  • Use a gentle, hydrating moisturizer to prepare your skin.
Treatment Day: What to Expect
  • Clean your skin thoroughly and avoid makeup or heavy skincare.
  • A numbing cream may be applied to reduce discomfort.
  • The treatment session will last between 30 to 60 minutes, depending on the procedure.
1 to 7 Days After: Immediate Aftercare
  • Mild redness and swelling are normal. Use cold compresses if needed.
  • Avoid using active skincare ingredients like retinol or acids.
  • Use a fragrance-free moisturizer and sunscreen daily.
7 to 14 Days After: Ongoing Aftercare
  • Your skin will start to heal, revealing smoother areas.
  • Continue avoiding direct sun exposure and apply SPF 50 sunscreen.
  • If dryness or peeling occurs, use soothing creams with hyaluronic acid or ceramides.
3 to 6 Months: Long-Term Maintenance
  • Attend follow-up sessions if required.
  • Use skincare products with peptides and antioxidants to maintain results.
  • Consider a maintenance peel or microneedling session every few months for optimal skin health.

Atrophic Scars (Indented Scars)

These scars result from tissue loss and appear as depressions in the skin. They are commonly seen after severe acne and are further divided into three subtypes:

  • Icepick Scars: Narrow, deep scars that resemble puncture marks.
  • Boxcar Scars: Wide and shallow, with defined edges.
  • Rolling Scars: Broad depressions with sloped edges, giving the skin a wavy appearance.

Hypertrophic and Keloid Scars (Raised Scars)

These scars form due to excess collagen production. Hypertrophic scars stay within the boundary of the original acne site, while keloid scars extend beyond it, forming large, raised areas. These scars are more common in individuals with darker skin tones.

Post-Inflammatory Hyperpigmentation (PIH)

Though not a true scar, PIH refers to dark spots left behind after acne heals. These spots are more prominent in individuals with darker skin tones and can take weeks to months to fade. Topical treatments like vitamin C or chemical peels can help reduce PIH.

How To Identify Your Acne Scar Type

Determining your scar type requires close examination. Icepick scars look like small pinholes, while boxcar scars appear broader with defined edges. Rolling scars have a wave-like appearance, making the skin look uneven. In contrast, hypertrophic and keloid scars are raised and can sometimes feel firm. Identifying the type will help your skincare provider suggest the most effective treatment method.

FAQ: Scar Classification and Treatments

There are several types of scars, each with unique characteristics:
  • Atrophic Scars:
    • Description: Depressed or sunken scars caused by tissue loss.
    • Examples: Acne scars, chickenpox scars.
    • Treatment: Microneedling, chemical peels, or laser resurfacing (e.g., Fraxel).
  • Hypertrophic Scars:
    • Description: Raised, thickened scars that remain within the wound boundary.
    • Common Causes: Surgical scars, burns, or injuries.
    • Treatment: Steroid injections, silicone sheets, or laser treatments (e.g., pulsed-dye laser).
  • Keloid Scars:
    • Description: Raised and larger than the original wound; can grow beyond the wound’s borders.
    • Common Causes: Genetic predisposition, often seen in darker skin tones.
    • Treatment: Steroid injections, cryotherapy, surgical excision, or laser therapy.
  • Contracture Scars:
    • Description: Tight, thickened scars that occur when the skin pulls together, often restricting movement.
    • Common Causes: Burns.
    • Treatment: Physical therapy, surgery, or skin grafts.
  • Hyperpigmented Scars:
    • Description: Dark discoloration that remains after an injury or acne heals.
    • Common Causes: Inflammatory conditions or trauma, especially in darker skin.
    • Treatment: Topical lightening agents (e.g., hydroquinone), chemical peels, or laser therapy.
  • Atrophic Scars:
    • Best suited for microneedling, subcision, or CO2 laser to promote collagen production.
  • Hypertrophic Scars:
    • Steroid injections can reduce thickness. Silicone sheets help flatten and soften the scar.
  • Keloids:
    • Cryotherapy or a combination of steroid injections and laser treatments can reduce size and prevent recurrence.
  • Contracture Scars:
    • Surgical options and physical therapy are often needed to restore movement.
  • Hyperpigmentation:
    • Chemical peels or topical products like retinoids and vitamin C serums work well to fade discoloration.
Several factors impact the type and appearance of scars:
  • Genetics: People with a family history of keloids are more likely to develop them.
  • Skin tone: Darker skin tones are more prone to hyperpigmentation and keloids.
  • Location: Scars on areas with more tension (like the chest or shoulders) may become hypertrophic or keloid.
  • Wound care: Proper wound management (e.g., keeping it clean and moist) reduces the risk of scarring.
  • Initial healing: Takes around 2 to 6 weeks for the wound to close and the scar to form.
  • Maturation phase: Can take 3 months to 1 year, as collagen production remodels the scar tissue.
  • Full scar improvement: Some treatments may take 6 months to 1 year to show final results, especially with laser or microneedling.
  • Most scars cannot be fully erased, but their appearance can be significantly improved.
  • Treatment goals focus on reducing the scar’s visibility, evening out skin texture, and minimizing pigmentation changes.
  • Hyperpigmentation refers to discoloration caused by excess melanin production following an injury. It is not a true scar and can fade over time with proper care.
  • Scars involve structural damage to the skin (e.g., raised or depressed areas) and may require more intensive treatments to correct.