News

Exosomes vs polynucleotides for acne scars UK

If you are researching regenerative options for acne scarring and post-inflammatory hyperpigmentation (PIH), you have probably seen both exosomes and polynucleotide injections mentioned alongside microneedling, RF microneedling, or CO2 laser.

They are not the same treatment, and neither is a direct replacement for scar remodelling procedures. In practice, they are most often used as supportive treatments to improve skin recovery, reduce inflammation, and help optimise collagen remodelling, particularly when used as part of a careful plan.

This guide explains how acne scars differ from PIH, how exosomes and polynucleotides work, who they may suit, realistic timelines, and safer ways to combine treatments in UK clinics.

Acne scars vs PIH, why they are often confused

Acne scars

Acne scars are structural changes in the skin caused by inflammation damaging collagen and elastin during acne. Common types include:

• Atrophic scars (depressions)
• Ice pick scars, narrow and deep
• Boxcar scars, wider with sharper edges
• Rolling scars, broader with tethering
• Hypertrophic or keloid scars (raised scars), more common on the chest, shoulders, jawline, and in those prone to abnormal scarring

True scars usually need procedures that create controlled injury and remodelling, such as microneedling, RF microneedling, subcision, or laser, sometimes combined with targeted fillers.

Post-inflammatory hyperpigmentation (PIH)

PIH is excess pigment left behind after inflammation, commonly after acne spots. It can look like brown, tan, or grey-brown marks that persist for months.

PIH is not a scar, but it can make scars look worse. PIH risk is higher if:

• Your skin tone is medium to deep
• Acne is ongoing or frequently inflamed
• You pick or squeeze lesions
• You have a history of pigmentation after minor irritation
• Aggressive treatments are used too soon or without proper pre and post care

Why this matters

Treating a patient for scarring when the main issue is PIH can lead to unnecessary downtime and higher pigmentation risk. Equally, focusing only on pigment when tethered scars are present may be disappointing.

A good plan usually addresses:

• Active acne control
• PIH prevention and pigment regulation
• Collagen remodelling for texture and tethering

What are exosomes and polynucleotides

Exosomes, what they are and how they may help

Exosomes are tiny extracellular vesicles released by cells. In aesthetics, they are used topically after procedures or, in some settings, as part of regenerative protocols. Their contents can include signalling molecules (such as proteins and microRNA) that may influence inflammation and repair processes.

In practical terms, clinics use exosome products with the aim to:

• Support skin recovery after controlled injury treatments
• Help calm inflammation and redness
• Improve overall skin quality over time

Important note on evidence and regulation: the exosome field is evolving. Product quality, sourcing, and clinical evidence can vary. In the UK, you should expect transparent discussion about what product is used, intended use (topical post procedure vs injection), and the realistic level of evidence for acne scarring and PIH.

Polynucleotides, what they are and how they may help

Polynucleotides (often derived from purified DNA fragments) are injectable skin bio-stimulators used to support tissue quality. They are generally positioned for:

• Hydration and barrier support
• Improved skin texture and elasticity
• Anti-inflammatory support in reactive or sensitised skin
• Gradual improvements in fine lines and skin resilience

For acne-prone individuals, polynucleotides are often chosen when the goal is to improve overall skin quality and recovery, rather than create rapid visible volume change.

Exosomes vs polynucleotides, what each is best suited to

Both are typically adjuncts, rather than the main scar-remodelling treatment. A simplified comparison is below.

Concern	Exosomes, typical goal	Polynucleotides, typical goal
Recovery after RF microneedling or laser	Support healing, calm inflammation, reduce prolonged redness	Support repair and resilience, improve texture over time
Active inflammation and sensitivity	Often selected to calm and support recovery, depending on protocol	Often selected for reactive skin and barrier support
Atrophic acne scars (texture, tethering)	Adjunct to help optimise remodelling, not a scar treatment alone	Adjunct to support collagen quality, not a scar treatment alone
PIH risk	Used to support a lower-inflammation healing environment	Used to strengthen and calm, may suit pigment-prone skin as a gentle option
Downtime	Usually minimal when used as an add-on	Usually minimal, small injection bumps possible

A realistic way to think about it:

• Exosomes are often discussed as a recovery and signalling support option, especially after energy-based treatments.
• Polynucleotides are often chosen as a gentle injectable to improve skin quality and resilience over a series.

Neither option directly removes deep ice pick scars, and neither replaces sun protection or pigment management in PIH.

Who may be a good candidate

By scar type

• Rolling scars with tethering often benefit most from subcision plus collagen remodelling (RF microneedling or fractional laser). Exosomes or polynucleotides may be used to support healing.
• Boxcar scars may respond to fractional resurfacing and microneedling based plans. Regenerative injectables can be supportive.
• Ice pick scars often need targeted approaches (for example TCA CROSS in selected patients) and may not significantly respond to regenerative injectables alone.
• Raised scars need caution. Energy devices and injectable choices must be individualised, and keloid-prone patients require conservative planning.

By skin tone and PIH risk

If you are prone to PIH or have a deeper skin tone, the safest pathway usually prioritises:

• Controlling inflammation and acne first
• Conservative device settings and longer intervals
• Strong aftercare and strict UV protection

Polynucleotides are often used in pigment-prone patients because they are generally a low downtime, barrier-supportive injectable. Exosomes may also be considered as part of calming, recovery-focused protocols, depending on the clinic and product.

Active acne

Treating scars while acne is flaring increases the risk of additional marks and PIH. Many patients do best with:

• A plan to stabilise acne first (often with a GP or dermatologist if required)
• Then scarring and pigment work once breakouts are controlled

Rosacea or highly sensitive skin

Both options may be considered as gentle supportive treatments, but procedure selection matters more. Aggressive laser or high-energy settings can worsen redness and trigger PIH-like changes in susceptible skin.

What results to expect and when to judge them

Exosomes

When used alongside RF microneedling or laser, some patients report:

• Faster settling of redness and inflammation
• A smoother, calmer recovery period

Visible texture changes in scars still depend mainly on the primary remodelling procedure and your scar type.

Polynucleotides

Results are typically gradual and relate to skin quality rather than dramatic scar lifting. Patients often notice:

• Improved hydration and glow
• More even-looking texture
• Better tolerance of subsequent treatments

Typical number of sessions

There is no one-size-fits-all. In UK aesthetic practice, a common pattern is:

• Polynucleotides: a course of 2 to 4 sessions, usually 2 to 4 weeks apart, then maintenance every few months if helpful
• Energy-based scar remodelling (RF microneedling or fractional laser): often 3 to 6 sessions, spaced 4 to 8 weeks apart, depending on device and skin response
• Exosomes as an add-on: may be used after selected sessions, often when prioritising recovery and inflammation control

When to assess outcomes

Collagen remodelling takes time. A reasonable approach is:

• PIH: early improvement can occur within weeks, but stubborn marks can take 3 to 6 months or longer
• Acne scar texture: judge the trend at 3 months after your last remodelling session, with continued improvement sometimes seen up to 6 to 12 months

Downtime and risks, with a focus on PIH

Common downtime

• Polynucleotides: small bumps at injection sites, mild swelling, occasional bruising, typically a few days
• RF microneedling: redness for 24 to 72 hours, mild swelling, dryness
• Fractional CO2: more significant downtime, redness and peeling, typically several days to two weeks depending on settings

PIH risk factors and how to reduce them

PIH is triggered by inflammation and UV exposure. To reduce risk:

• Choose conservative settings initially, especially in medium to deep skin tones
• Avoid stacking too many inflammatory treatments at once
• Use strict UV avoidance and daily broad-spectrum SPF, even in winter
• Do not pick at flaking or scabs
• Follow a pigment-safe skincare plan advised by your clinician

Other risks to discuss

– Infection risk, particularly if aftercare is not followed
– Acne flare-ups in some individuals after certain procedures or occlusive products
– Allergic or inflammatory reactions, rare but possible
n## Safer treatment-stacking pathways in UK clinics

“Stacking” means combining treatments to improve results while keeping risk acceptable. The safest stacks are usually stepwise, with time for the skin to settle.

Pathway 1, PIH-prone or sensitive skin (often the safest start)

• Stabilise acne and skin barrier first
• Gentle skin quality support, for example polynucleotides over a short course
• Introduce conservative RF microneedling (for example Sylfirm X or Morpheus8) once skin is stable
• Consider exosomes as a post-procedure recovery adjunct in selected patients

Pathway 2, mixed scarring and PIH in lighter skin tones

• RF microneedling course for texture
• Add polynucleotides between sessions if the skin is reactive or dry
• Consider exosomes after higher-intensity sessions if recovery tends to be slow

Pathway 3, deeper textural scarring where resurfacing is needed

• Careful assessment of scar type, including whether subcision is needed
• Fractional laser or CO2 considered only when appropriate and when PIH risk is acceptable
• Regenerative support (polynucleotides and or exosomes depending on protocol) to optimise recovery

What to avoid when trying to reduce PIH

• Multiple high-inflammation procedures in the same visit without clear clinical rationale
• Rushing session intervals before redness and heat have fully settled
• Treating through active inflamed acne lesions
• Unsupervised use of strong actives immediately after procedures
• Sun exposure or tanning before and after treatments

Practical questions to ask at your consultation

• Are my main concerns scars, PIH, or both
• What scar types do I have, and do I need subcision
• What is my PIH risk based on skin tone and history
• Which device is being used, and why that one
• How many sessions are likely, and what is the total timeline
• What aftercare reduces PIH risk in my case
• What is the plan if PIH occurs

Bottom line

For most patients, the exosomes vs polynucleotides decision is less about choosing a winner and more about matching the option to your skin behaviour, scar type, and risk profile. Structural acne scars usually need a remodelling procedure, while exosomes and polynucleotides may help support recovery, calm inflammation, and improve overall skin quality when used thoughtfully.

If you would like an individual plan that considers scarring type, PIH risk, skin tone, and acne control, you can be assessed by experienced medical professionals at Renovatio Clinic.