In short. Acne scars are permanent changes in skin texture left where inflammation from acne destroyed collagen, producing dents or raised areas. They differ from red and dark marks, which are colour changes that fade over months. Active acne is controlled before scar treatment starts, and improvement comes over a course of sessions rather than one appointment.
Key points
- Red and dark marks are colour changes; true scars are texture changes.
- Red marks fade over weeks to months; dark marks fade more slowly.
- True scars are permanent: too little collagen leaves a pit, too much a raised bump.
- Active acne is controlled first; scar treatment begins only on quiet skin.
- Treatment is matched to scar type and staged over sessions to limit pigment risk.
Red marks, dark marks, true scars
After acne heals, the skin often keeps a record. Three kinds of marks are commonly confused: red marks (post-inflammatory redness), dark marks (post-inflammatory pigmentation), and true scars (permanent dents or raised areas). Each behaves differently and each has different treatments, so much of scar treatment is choosing which of the three is actually present.
Red marks are small dilated vessels left after inflammation, and most fade over weeks to months on their own. Dark marks are pigment dropped into healing skin; they fade more slowly and darken with sun exposure. True scars form when inflammation destroys collagen, either too little (a pit) or too much (a raised bump). Time helps the first two; it does not repair true scars.
What else could it be?
Flat brown patches after acne may be post-inflammatory pigmentation, but similar spots can be freckling, early melasma, or other pigment conditions, and the distinction matters because treatment differs. Raised bumps on the chest, shoulders, or jawline may be keloid-prone scars rather than active acne.
How are the types assessed?
Good lighting, dermatoscope examination, and photographs grade the scar types and their depth. Mixed patterns are the rule: most patients have several scar types at once, which is why combination plans outperform single-treatment approaches.
Step one: control the acne
Nothing treats scars well while new acne keeps adding them. Active acne is controlled first, sometimes with isotretinoin when scarring is ongoing, and scar treatment begins only on quiet skin.
Step two: match treatment to scar type
| Type | What it is | Main options | Also used |
|---|---|---|---|
| Red marks | Small dilated vessels left after inflammation | Time and gentle skincare | Vascular-targeting laser if they persist |
| Dark marks | Pigment dropped into healing skin | Strict sun protection and pigment-directed topicals | Chemical peels or pigment lasers for stubborn cases |
| Indented (atrophic) scars | Too little collagen, leaving a pit | Microneedling and fractional lasers | Subcision to release tethered scars; fillers for selected deep defects |
| Raised scars | Too much collagen, leaving a bump | Silicone therapy and injection | Laser; surgery only within a keloid-prevention protocol |
| Keloid-prone raised scars | A raised scar growing beyond its original boundary | Prompt assessment for possible keloid | Surgery, only within a keloid-prevention protocol |
Indented scars in particular are usually treated in combination and over sessions rather than with a single tool.
What improvement is realistic?
Scar treatment improves skin; it does not restore it to pre-acne perfection. Most patients see meaningful smoothing over a course of sessions spaced weeks apart, with final judgement after the skin has fully recovered between sessions. Aggressive single-session treatment increases pigment risk, especially in darker skin tones, so staged plans are used instead of one intensive appointment.
Long-term skin health and when to seek review
After scar treatment, the skin needs the same discipline that controls acne in the first place: maintenance topicals, sun protection, and early care of any flare. Preventing the next scar is always easier than treating the last one.
Arrange assessment if:
- Acne is still active while scars accumulate; the priority is stopping new damage.
- A raised scar is growing beyond its original boundary (possible keloid).
- Treatment is causing darkening rather than lightening of the skin.
Sources
- American Academy of Dermatology — acne scars: diagnosis and treatment
- British Association of Dermatologists — acne patient information
- NICE Clinical Knowledge Summaries — acne vulgaris
Internal links
Frequently asked questions
Will acne scars fade on their own?
Red marks and dark marks usually fade with time, red ones over weeks to months and dark ones more slowly. True scars form when inflammation destroys collagen, and time does not repair them. Scar treatment improves skin rather than restoring it to pre-acne perfection.
Can scars be treated while acne is still active?
No. Nothing treats scars well while new acne keeps adding them, so active acne is controlled first, sometimes with isotretinoin when scarring is ongoing. Scar treatment begins only on quiet skin, because treating scars while new ones form is working against a moving target.
How many sessions does acne scar treatment need?
Most patients need a course of sessions spaced weeks apart, with the result judged after the skin has fully recovered between them. Aggressive single-session treatment increases pigment risk, especially in darker skin tones, so staged plans are used instead of one intensive appointment.
Risks & Limitations
- Most chronic skin disease is managed rather than cured, and relapse is expected.
- Treatments typically need 8–12 weeks before response can be judged fairly.
- Topical treatment can cause irritation, dryness, peeling and photosensitivity.
- Systemic therapy may require blood monitoring and carries organ, metabolic and pregnancy risks.
- Isotretinoin in particular requires strict monitoring and pregnancy prevention.
- Pigment change is often slow and may be incomplete.
- No treatment works for everyone, and response cannot be predicted with certainty.
When to Seek Care
- A mole or lesion that changes in size, shape or colour, or starts to bleed, itch or crust.
- Fever with a widespread rash, blistering, or rash involving the eyes, mouth or genitals — seek emergency care.
- Rapidly spreading redness, swelling or pain in the skin.
- Facial swelling or difficulty breathing — possible severe reaction; seek emergency care immediately.
- New or worsening symptoms while taking a monitored medication.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- World Health Organization (WHO) — skin and infectious disease resources
- Chinese Medical Association, Dermatology Branch — clinical guidance
- Cochrane Library — systematic reviews in dermatology
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.