Why Acne Scars Don't Shallow Right Away — New Collagen Takes 4–8 Weeks
After Subcision and laser, acne scars don't shallow immediately — new collagen needs 4–8 weeks to mature. Dr. Big explains the real timeline · acne scar clinic Ratchathewi, near BTS.
The question Dr. Big hears most often after Subcision is — “Doctor, it’s been a week and the scar looks exactly the same?”
I understand the feeling completely. You paid, you went through the discomfort, and you want to see results right away. But the biological reality of skin is this — acne scars shallow after the new collagen matures, which takes 4–8 weeks — not on the day of treatment.
Once you understand this timeline, you won’t lose heart halfway, and you won’t mistakenly think “it didn’t work.”
What happens under the skin on treatment day
On the day of the procedure, here’s what the doctor does:
- Subcision cuts the fibrous bands tethering the base of the scar — like cutting the threads pulling a fabric down. Once released, the scar floor can “float” back up.
- MNRF / laser creates controlled micro-injuries that signal your body to “come repair here.”
But on that day, new collagen hasn’t formed yet. What you see is swelling from the stimulation, which can make scars “look temporarily shallower” — then once the swelling settles it seems to return to before. This is exactly where many people misunderstand and give up.
New collagen builds in stages — not in a single day
The body builds collagen to repair through a 3-phase process:
Phase 1: Inflammation (days 0–3)
The body sends cells to clear the stimulated area. There’s swelling and redness here — no collagen yet.
Phase 2: Rebuilding (weeks 1–4)
Fibroblast cells start producing type III collagen, which is still “soft” and disorganized. The scar begins to change, but the eye can barely see it.
Phase 3: Remodeling for strength (week 4–8 and beyond)
Type III collagen is gradually replaced by stronger, well-organized type I collagen — this is when scars genuinely shallow, and the reason you have to wait 4–8 weeks.
The timeline to expect (after the first session)
- Weeks 1–2: swelling settles, the scar looks the same — completely normal, don’t give up yet
- Weeks 3–4: scar edges start to soften, dark marks begin to fade
- Weeks 4–6: subtle shallowing becomes visible
- Weeks 6–8: the first session’s result is at its clearest — the ideal moment for the next session
Roughly 30–50% of the result comes from the first session, then another 10–20% each time after, adding up to a 60–80% improvement once the course is complete.
Why you should space sessions 4–8 weeks apart
If you repeat too soon, the previous round’s collagen hasn’t finished “maturing” yet, and re-stimulating disrupts what’s already there instead of building on it — not worth the discomfort. Spacing sessions so phase-3 collagen can finish is why Dr. Big always books sessions 4–8 weeks apart — not because he wants you coming in often.
What you can do to help collagen mature well
These 4–8 weeks are when your “70% homework” matters most:
- Eat enough protein and vitamin C — the direct raw materials for collagen
- Wear sunscreen every day — UV damages the collagen you’re building
- Sleep enough — the body repairs skin during deep sleep
- Drink plenty of water; avoid smoking and heavy alcohol
Frequently asked questions
Q: How many days after Subcision until I see results? A: Most people start to see clear change around weeks 4–6, peaking at 6–8 weeks — not within a few days.
Q: It’s been 2 weeks and the scar is unchanged — is that abnormal? A: Not at all. It’s the normal collagen timeline. The collagen phase that shallows scars only starts working from about week 4 onward.
Q: Will doing it more often heal faster? A: No — going too frequently disrupts the previous round’s collagen. Spacing 4–8 weeks to let it mature is the most effective approach.
Q: Why do some clinics say you’ll see results immediately? A: What you see immediately is usually swelling that makes scars look temporarily shallower; once it settles, it returns. Real results require collagen — Dr. Big chooses to tell you honestly.
Q: Where can I consult about Subcision? A: At Clarity Clinic Ratchathewi, near BTS — easy to reach from Siam, Phaya Thai, and all of Bangkok. Message LINE with a photo for Dr. Big to assess first.
Summary
Acne scars don’t shallow on the day you treat them — they shallow 4–8 weeks later, when the new collagen matures in your body. Understanding this timeline keeps you from giving up halfway, and helps you take care of yourself at the moment that matters most.
Contact:
- LINE: @clarityclinic — send a photo of your acne scars for Dr. Big to review
- Location: Spring Tower, B Floor · Ratchathewi, near BTS (Siam, Phaya Thai, all Bangkok)
- Free 30-minute consult with Dr. Big in person
- Price 5,000 baht/session including all procedures + aftercare cream · pay per session, no packages
Read next:
