Breakouts & Pores
Post-Inflammatory Erythema
Post-inflammatory erythema describes flat pink-to-red marks left behind after acne or another inflamed spot has healed, caused by small blood vessels near the skin’s surface rather than by extra pigment.
Overview
What is post-inflammatory erythema?
Post-inflammatory erythema, sometimes shortened to PIE, is a flat pink or red mark that remains after an inflamed lesion, such as an acne spot, has settled. It is thought to relate to small, dilated or injured blood vessels and temporary thinning of the skin’s surface layer during the healing process, rather than to a build-up of melanin.
It is one of several possible post-acne marks, and tends to be more visible on lighter skin tones because the underlying vessels show through more easily, although it can occur on any skin tone.
Common signs and patterns
What post-inflammatory erythema can look or feel like
These features can provide context, but they do not confirm a diagnosis on their own.
Flat pink or red marks
The area is flush with the surrounding skin, without the raised or indented texture seen in true scarring.
Colour that briefly pales under pressure
Because the colour comes from blood vessels, gentle pressure can temporarily lighten the mark, a sign that points toward a vascular cause.
Marks that follow recently healed breakouts
Marks typically appear in the exact spot where a spot or inflamed lesion has recently resolved.
A flat surface, distinct from acne scars
Unlike textured scarring, post-inflammatory erythema does not change the shape of the skin’s surface.
Causes and contributors
Erythema comes from vascular changes during healing, not pigment.
When a spot becomes inflamed, nearby small blood vessels can dilate or become temporarily damaged, and the surface layer of skin can thin slightly as it heals. Together, these changes let more blood show through, producing a pink or red mark rather than a brown one.
Sun exposure, heat, picking at healing lesions and ongoing inflammation from active acne can all prolong how long the redness is visible.
What it may be confused with
Similar-looking marks need different decisions
Flat colour change after a breakout is not always the same underlying process, and mixing them up can lead to the wrong treatment.
Post-inflammatory hyperpigmentation
Brown or grey-brown marks caused by extra melanin, rather than the pink-to-red tone of vascular erythema.
Facial redness or rosacea
Ongoing flushing, visible vessels or bumps unrelated to a specific healed lesion suggest a different underlying pattern.
Active, inflamed acne
Tender, raised or pus-filled lesions reflect ongoing inflammation, distinct from the flat marks left once a lesion has settled.
Acne scars
Indented or raised structural changes need different management from a flat colour mark.
Bottom line
Protect healing skin from the sun and give vascular marks time to fade.
Most post-inflammatory erythema improves gradually over weeks to months as the underlying vessels settle.
Consistent sun protection and a calm, non-irritating routine support this process; persistent or extensive redness can be discussed with a clinician about vascular-targeted options.
Evidence-supported options
Choose the option that matches how long marks have been present
This is general education, not a personal treatment plan. Product strengths, permitted uses and prescription status vary by country.
Daily broad-spectrum sunscreen
Helps prevent marks from darkening or lingering longer under UV exposure.
Limit: Protects healing skin but does not fade existing marks quickly on its own.
A calm, non-irritating routine
Avoiding unnecessary irritation supports the skin’s healing process while vessels settle.
Limit: Supportive rather than a direct treatment for existing redness.
Vascular laser treatment
Lasers that target haemoglobin in small vessels can reduce persistent post-inflammatory erythema for some people.
Limit: Requires professional assessment, typically more than one session, and is not universally accessible.
Calming topical ingredients
Ingredients such as niacinamide may support overall skin comfort while marks fade.
Limit: Evidence for directly resolving vascular redness is limited compared with laser treatment.
Supportive skincare
A simple routine while marks fade
Supportive skincare should protect healing skin and avoid adding further inflammation.
Morning
- Cleanse gentlyUse a mild, fragrance-free cleanser.
- Apply a calming serum if desiredNiacinamide or similar ingredients can support comfort.
- Moisturise and protectFollow with a moisturiser and daily broad-spectrum sunscreen.
Evening
- Cleanse onceRemove makeup and sunscreen without scrubbing.
- Keep active ingredients minimalAvoid layering several strong actives while skin is still healing.
- MoisturiseSupport the skin barrier overnight.
Common mistakes
What can make post-inflammatory erythema harder to manage
- Picking or squeezing healing lesions, which can prolong redness and increase the risk of scarring.
- Skipping daily sunscreen while marks are still visible.
- Assuming a flat red mark is a permanent scar rather than a temporary vascular change.
- Introducing several new strong actives at once while the skin is still healing.
When professional help makes sense
Seek assessment when redness is extensive or slow to resolve.
- Redness that remains widespread or unchanged after several months of consistent sun protection
- Uncertainty about whether marks are post-inflammatory erythema, hyperpigmentation, or a condition such as rosacea
- Interest in vascular laser treatment for persistent marks
- Ongoing active acne that needs its own treatment before marks can be expected to settle
Related reading
Continue with the next useful question
Editorial record
What this page knows, and what remains uncertain
Evidence summary
Current dermatology sources describe post-inflammatory erythema as a vascular process distinct from pigment-based marks, generally fading over time, with vascular lasers noted as a professional option for persistent cases.
Review status
Financial transparency
No paid product placement or affiliate ranking is included on this foundation page.
Recommendation logic
Options are organised by evidence grade and the point at which professional vascular treatment becomes a reasonable addition.
Frequently asked questions
Short answers to common questions
What is the difference between post-inflammatory erythema and hyperpigmentation?
Post-inflammatory erythema is a pink-to-red mark caused by small blood vessels near the skin’s surface, while post-inflammatory hyperpigmentation is a brown or grey-brown mark caused by extra melanin; the two can occur separately or together after the same healed lesion.
How long does post-inflammatory erythema take to fade?
Many marks fade gradually over weeks to months as the underlying blood vessels settle, although the exact timeline varies between individuals.
Does sunscreen really help post-inflammatory erythema?
Daily sunscreen does not erase existing marks instantly, but it helps prevent them from becoming more noticeable or lasting longer under UV exposure.
Can I speed up post-inflammatory erythema with vitamin C or makeup?
Makeup can temporarily cover marks, and some antioxidant ingredients may support overall skin comfort, but there is limited evidence that either meaningfully speeds the underlying vascular healing process.
Sources reviewed
Guidance behind this page
- DermNet NZ: Acne scarring — post-inflammatory erythema and hyperpigmentation
- The Journal of Clinical and Aesthetic Dermatology: Easy as PIE (postinflammatory erythema)
Sources support general editorial guidance. They do not replace regional product labels, prescribing information or personal medical assessment.