Larger molecule
Mandelic acid has a larger molecular size than glycolic acid, which contributes to slower penetration through the skin surface.
Skin Peels · South Kensington
Mandelic Acid Peel
A gentler AHA peel for congestion, uneven tone and dull or reactive skin.
Mandelic acid has a larger molecular structure than glycolic acid, so it penetrates more slowly. This can make it a useful option where we want controlled exfoliation with a lower irritation profile.
The treatment
What is a mandelic acid peel?
Mandelic acid is an alpha-hydroxy acid used in professional chemical peel treatments to exfoliate the upper layers of the skin.
Compared with smaller-molecule AHAs such as glycolic acid, mandelic acid penetrates more gradually. This can make it useful when the aim is effective exfoliation without unnecessarily aggressive treatment.
At Santi, peel strength and contact time are selected according to skin condition, previous peel experience and the concern being treated.
Often considered for:
- Congestion
- Comedonal acne
- Dull or rough skin
- Uneven tone
- Post-inflammatory marks
- Clients who may not tolerate stronger AHAs as comfortably
- Maintenance exfoliation
A slower-penetrating AHA
Controlled exfoliation
It can provide useful keratolytic exfoliation while allowing a more measured approach for selected skin types.
Lower irritation potential
For some clients, mandelic is better tolerated than more aggressive acid protocols. Suitability still depends on the individual skin.
Treatment at Santi
See a professional skin peel at Santi London
Chemical peel treatment is more than applying an acid and waiting. Skin condition, preparation, strength, contact time and response all need to be considered.
This treatment video gives a sense of how professional peels are performed at Santi in South Kensington.
Mandelic peel treatment goals
Congestion
Controlled exfoliation can help reduce superficial build-up and support a clearer skin surface where congestion is a concern.
Blemish-prone skin
Mandelic may be considered in selected acne-prone skin as part of a wider treatment and homecare strategy.
Post-inflammatory marks
A staged peel plan may help improve the appearance of selected post-inflammatory pigmentation where treatment is appropriate.
Dullness
Removing excess surface keratin can make skin look smoother, brighter and more reflective.
Uneven texture
Regular superficial exfoliation can help refine roughness and improve the feel of the skin.
Reactive skin
Mandelic may be considered where a gentler acid approach is preferred, but reactive skin still requires individual assessment.
What happens during a mandelic peel?
Skin assessment
We review your skin, current products, previous peel experience and any factors that could increase sensitivity.
Preparation
The skin is cleansed and prepared so that the peel can be applied evenly and safely.
Peel application
Mandelic acid is applied for a controlled period. Strength and contact time are selected according to your skin and treatment plan.
Finish & aftercare
The peel is removed or neutralised as appropriate, followed by soothing products and post-treatment guidance.
What should you expect?
Immediately
The skin may look slightly pink, feel warm or feel a little tight after treatment.
Next few days
Some clients experience light dryness or fine flaking. Others have very little visible peeling.
Following week
Skin usually settles quickly and may appear smoother and brighter as surface cell build-up is reduced.
Mandelic vs glycolic vs salicylic
| Peel | Type | Often considered for | Character |
|---|---|---|---|
| Mandelic | AHA | Congestion, dullness, uneven tone, selected reactive skin | Slower penetrating and generally gentler |
| Glycolic | AHA | Texture, dullness, photoageing and selected pigmentation concerns | Smaller molecule with faster penetration |
| Salicylic | BHA | Oiliness, congestion and blemish-prone skin | Oil-soluble and particularly useful for follicles |
A conservative peel strategy matters
Darker skin tones
Mandelic acid is often discussed as a useful option for deeper skin tones because of its slower penetration and generally lower irritation profile.
That does not mean every peel is automatically risk-free. Post-inflammatory pigmentation can follow irritation, so treatment must still be selected carefully.
Post-inflammatory pigmentation
Where dark marks follow acne or inflammation, the aim is controlled treatment without creating additional inflammation that could worsen pigmentation.
SPF and appropriate homecare are essential parts of the strategy.
When a peel may need to wait
Please tell us if you have:
- Active infection or open skin
- Active cold sores in the treatment area
- Recent significant sun exposure or tanning
- Very irritated or compromised skin
- Recent stronger resurfacing treatments
- Medication affecting skin sensitivity or healing
Reactive skin needs assessment
“Mandelic is gentle” does not mean every reactive skin condition should automatically be peeled.
If skin is acutely inflamed, barrier-impaired or unstable, supporting skin health first may be more appropriate than exfoliation.
One peel or a course?
Single treatment
A single peel can be useful for superficial brightening and maintenance where the skin is already stable.
Course of treatments
Congestion, blemish-prone skin and uneven tone often respond better to a planned series than to one isolated peel.
Review as you go
Treatment strength and frequency should be adjusted according to how the skin responds rather than following a rigid protocol.
Mandelic Acid Peel at Santi
Single treatment
£200
Professional mandelic acid peel with skin assessment and aftercare.
Course of six
£1,000
Six-treatment course — equivalent to saving £200 compared with booking six individual sessions.
Keep the skin calm while it settles
Use SPF
Apply broad-spectrum SPF daily and minimise unnecessary sun exposure after treatment.
Pause strong actives
Avoid retinoids, exfoliating acids and scrubs until the skin feels fully settled.
Don't pick
If light flaking develops, allow it to shed naturally rather than trying to remove peeling skin manually.
Keep cleansing gentle
Use a mild cleanser and avoid unnecessary friction while the skin barrier is recovering.
Moisturise
A simple, barrier-supportive moisturiser can help with temporary dryness or tightness.
Contact us if concerned
Get in touch if you develop unexpected blistering, significant pain, persistent swelling or another reaction that concerns you.
Mandelic Acid Peel FAQs
Is mandelic acid gentler than glycolic acid?
Generally, yes. Mandelic acid has a larger molecular size and penetrates more slowly than glycolic acid, which can make it better tolerated for some clients. Suitability still depends on the individual skin.
Will my skin actually peel?
Not necessarily. Some clients experience light flaking or dryness, while others have very little visible peeling. A chemical peel can still be effective without dramatic shedding.
Is mandelic acid good for acne?
It may be useful for selected blemish-prone or congested skin, particularly as part of a wider treatment and homecare strategy. More inflammatory or persistent acne may require medical assessment.
Can mandelic acid help pigmentation?
It may help improve selected superficial uneven tone and post-inflammatory marks. Pigmentation has different causes, so the appropriate treatment depends on diagnosis and skin type.
Is mandelic acid suitable for darker skin tones?
It can be a useful peel option because of its slower penetration and generally lower irritation potential. However, darker skin can still develop post-inflammatory pigmentation if irritated, so conservative assessment remains important.
How often can I have a mandelic peel?
Frequency depends on peel strength, your skin response and treatment goal. A course may be spaced over several weeks rather than performing strong treatments too frequently.
Can I use retinol after a mandelic peel?
Retinoids are usually paused while the skin settles after a peel. Your practitioner will advise when to restart based on the treatment strength and your skin response.
Is mandelic peel suitable for rosacea?
Not automatically. Rosacea is an inflammatory skin condition and active or unstable rosacea may be irritated by exfoliating treatments. Suitability should be assessed individually rather than assuming that a gentler acid is appropriate for every rosacea-prone skin.
Other peel options
Santi London · South Kensington
Is mandelic the right peel for your skin?
The best peel is not simply the strongest one. We assess skin type, barrier condition, congestion, pigmentation and treatment history before choosing the acid, concentration and course that make sense for your skin.
Mandelic Acid Peel £200 · Course of six £1,000 · Treatment subject to assessment and suitability · Santi London, 33 Thurloe Street, South Kensington, London SW7 2LQ.