After acne clears, some people are left with persistent red or pink marks, while others develop brown or dark pigmentation.
Although both are often called “acne scars,” flat discoloration is more accurately described as a post-inflammatory mark.
The key distinction is simple:
PIE is primarily vascular. PIH is primarily pigment-related.
That difference determines which technology should be considered.
Contents
1. PIE and PIH Develop Through Different Mechanisms
PIE — Post-Inflammatory Erythema refers to persistent redness following inflammation.
After an inflamed acne lesion settles, vascular changes can remain in the affected area, leaving pink, red or reddish-purple marks.
In simple terms:
Inflammatory acne → persistent vascular changes → visible red marks.
PIH — Post-Inflammatory Hyperpigmentation, on the other hand, develops when inflammation stimulates excess melanin production.
The resulting marks may appear light brown, dark brown or grey-brown.
The distinction can be remembered as:
PIE = red/pink → vascular.
PIH = brown/dark → melanin.
Some patients may have both at the same time.
2. Why Does PIE Need Vascular Technology While PIH Needs Pico Laser?
PIE: SHINY PLUS or Smartrion Long
For persistent PIE, treatment may focus on the vascular component responsible for visible redness.
At Oceania, one option is SHINY PLUS, a fractional pulsed-light system with a 560 nm application for vascular concerns and facial redness.
Its fractional design distributes treatment energy across multiple micro-zones, allowing treatment to be adapted according to the target.
SHINY PLUS certifications: FDA – KFDA – CE.
For selected vascular concerns, the physician may also consider Smartrion Long, a Long Pulsed Nd system.
Its 1064 nm wavelength targets hemoglobin and is used for vascular lesions, visible capillaries and post-acne redness.
The system also incorporates Cryo Air Cooling and Frostwatch to support surface-temperature control during treatment.
Smartrion Long certifications: FDA – KFDA – CE 0120.
Not every red acne mark requires immediate device treatment. Active acne or significantly irritated skin may need to be addressed first.
PIH: Pico Max for excess melanin
PIH requires a different treatment target because the discoloration is driven by excess melanin.
Oceania uses Pico Max within its pigmentation protocols.
The system delivers ultra-short 350-picosecond pulses to break pigment into smaller particles that can then be gradually processed by the body.
It may be considered for post-acne pigmentation, freckles, age spots and other appropriate pigmentation concerns.
Pico Max certifications: FDA – KFDA – CE.
Higher energy is not automatically better. Excessive irritation may trigger further inflammation and potentially make PIH more visible.
Mesotherapy supports skin quality
Mesotherapy serves a different purpose.
When skin is dry, sensitive or requires additional support during treatment, an appropriate Meso protocol may be considered to support hydration, recovery and overall skin quality.
In short:
PIE → SHINY PLUS / Smartrion Long.
PIH → Pico Max.
Skin recovery → supportive Mesotherapy when appropriate.
3. How Does Oceania Personalize PIE and PIH Treatment?
At Oceania Spa & Clinic, post-acne discoloration is not treated with one standard protocol.
The physician first determines whether the marks are predominantly red, brown or mixed, while also assessing active acne, skin sensitivity and previous aesthetic treatments.
For PIE, SHINY PLUS or Smartrion Long may be selected according to the vascular presentation.
For PIH, Pico Max may be incorporated when the pigmentation is appropriate for laser treatment.
If a patient has active acne, PIE and PIH at the same time, treatment may be staged rather than using every technology in one appointment:
Control active acne → address redness → treat pigmentation → support skin recovery.
The advantage of having multiple technologies is not simply having more machines. It is being able to match the device to the mechanism behind the mark:
- SHINY PLUS – FDA, KFDA, CE: for redness and vascular concerns.
- Smartrion Long – FDA, KFDA, CE 0120: Long Pulsed Nd 1064 nm for vascular lesions and post-acne redness.
- Pico Max – FDA, KFDA, CE: 350-picosecond laser for pigmentation concerns including post-acne dark marks.
Conclusion
PIE and PIH can both remain after acne, but they are fundamentally different.
PIE is mainly vascular redness. PIH is mainly excess melanin.
So instead of asking:
“Which laser is best for acne marks?”
the better starting point is:
“Is this mark red because of vascular changes, or brown because of pigmentation?”
At Oceania Spa & Clinic, the physician first differentiates PIE, PIH and mixed post-acne marks before selecting SHINY PLUS, Smartrion Long, Pico Max and supportive Mesotherapy according to the individual skin condition.
