Salicylic Acid vs Glycolic Acid: What’s the Difference?
Salicylic acid and glycolic acid are both chemical exfoliants used to improve skin texture, congestion, acne, and uneven skin tone. However, they work in different ways and are suited to different skin concerns.
Choosing the right acid depends on your skin type, sensitivity, and goals.
What Is Salicylic Acid?
Salicylic acid is a beta hydroxy acid (BHA) that is oil-soluble, meaning it can penetrate deeper into the pores.
This makes it particularly effective for:
- oily skin
- clogged pores
- blackheads
- acne-prone skin
- inflammatory breakouts
Salicylic acid helps dissolve excess oil and dead skin build-up inside the pore, reducing congestion and helping prevent future breakouts.
Because it works within the pores themselves, it is often one of the best ingredients for acne-prone skin.
Recommended Salicylic Acid Products
Medik8 Surface Radiance Cleanse
A brightening exfoliating cleanser containing salicylic acid and mild exfoliating acids designed to improve congestion, texture, and dullness.
SkinCeuticals Blemish + Age Defense
An oil-free serum formulated with salicylic acid to help reduce breakouts, congestion, excess oil, and visible signs of ageing simultaneously.
SkinCeuticals Simply Clean
A gel cleanser designed to remove excess oil and impurities while gently exfoliating the skin.
What Is Glycolic Acid?
Glycolic acid is an alpha hydroxy acid (AHA) derived from sugar cane. Unlike salicylic acid, glycolic acid is water-soluble and works mainly on the surface of the skin.
It helps:
- improve dullness
- brighten pigmentation
- smooth rough texture
- soften fine lines
- improve skin radiance
Because glycolic acid exfoliates the upper layers of skin, it is commonly used in anti-ageing and pigmentation-focused routines.
It can also help improve post-inflammatory hyperpigmentation left after acne breakouts.
Recommended Glycolic Acid Products
NeoStrata Ultra Brightening Cleanser
A glycolic acid-based cleanser designed to brighten uneven skin tone and improve dullness.
Skinbetter Science Alpharet Overnight Cream
Combines a retinoid with alpha hydroxy acids to improve texture, pigmentation, and visible signs of skin ageing.
Medik8 Balance Moisturiser™
A lightweight moisturiser designed to support skin balance and hydration while helping maintain a clearer-looking complexion. Ideal for combination and blemish-prone skin types when using exfoliating acids and active ingredients.
Which Acid Is Better for Acne?
For oily or acne-prone skin:
Salicylic acid is usually the better option.
Because it penetrates into the pores, it is particularly effective for:
- blackheads
- whiteheads
- congestion
- inflammatory acne
Patients with active breakouts often benefit more from salicylic acid-based cleansers or serums.
Which Acid Is Better for Pigmentation & Ageing?
For pigmentation, dullness, and texture:
Glycolic acid is often more beneficial.
It helps improve:
- uneven skin tone
- post-inflammatory pigmentation
- rough texture
- fine lines
- skin radiance
Because glycolic acid works more superficially, it is particularly useful for improving overall skin brightness and smoothness.
Can You Use Both Together?
In some routines, yes.
Many patients benefit from:
- salicylic acid for congestion and oil control
- glycolic acid for surface exfoliation and pigmentation
However, over-exfoliation can damage the skin barrier and increase irritation, redness, and sensitivity.
This is why introducing acids gradually and using barrier-supporting skincare is essential.
Ingredients That Pair Well With Acids
Niacinamide
Niacinamide helps reduce inflammation and support the skin barrier when using exfoliating acids.
Medik8 Niacinamide Peptides
Helps calm the skin while supporting barrier repair and oil balance.
Retinoids
Retinoids can complement exfoliating acids by improving skin turnover and collagen production.
Medik8 Crystal Retinal
A next-generation vitamin A treatment designed to improve texture, pigmentation, and overall skin clarity.
Skinbetter Science AlphaRet Overnight Cream
Combines retinoid technology with gentle exfoliation for smoother, brighter skin.
The Importance of SPF
Both salicylic acid and glycolic acid can increase sun sensitivity.
Daily SPF is essential to:
- protect the skin barrier
- reduce pigmentation risk
- prevent post-inflammatory marks
- minimise UV-induced ageing
Heliocare 360 Pigment Solution Fluid SPF50+
Provides high-level daily protection while supporting pigmentation-prone skin.
iS CLINICAL Extreme Protect SPF
Broad-spectrum SPF protection designed to support overall skin health and environmental defence.
When to Seek Professional Advice
Not all acids are suitable for every skin type. Overuse or incorrect combinations can worsen sensitivity, inflammation, or pigmentation.
A personalised consultation can help determine:
- which exfoliating acids are best for your skin
- how often to use them safely
- which products suit your skin concerns
- whether prescription treatments may be beneficial
Book a consultation for a personalised skincare plan tailored to your skin.
Download Our Free Skincare Ebooks
Want to learn more about building an effective skincare routine?
Download our free ebooks covering:
- acne
- pigmentation
- rosacea & redness
- skin ageing & prevention
Download your free skincare ebooks here
Frequently Asked Questions
Is salicylic acid or glycolic acid better for acne?
Salicylic acid is generally better for acne because it penetrates into the pores to reduce oil, congestion, and breakouts.
Can glycolic acid help acne marks?
Yes. Glycolic acid can help improve post-inflammatory pigmentation and uneven texture left behind after acne.
Can I use salicylic acid and glycolic acid together?
In some cases, yes — but overuse can irritate the skin barrier. It is often best to introduce acids gradually or alternate usage.
Which acid is better for sensitive skin?
This depends on the individual. Some sensitive skin types tolerate low-strength salicylic acid better, while others may find glycolic acid irritating.
Do I need SPF when using acids?
Yes. Daily SPF is essential when using exfoliating acids to reduce the risk of pigmentation and sun sensitivity.
Written By
Dr S Ahmed | Villa Skincare
Updated July 2026