Exfoliating Acids Guide

If you’re new to chemical exfoliation, this Exfoliating Acids Guide will help you understand the differences between AHA, BHA, LHA and PHA. First, each acid family works differently on the skin. Therefore, choosing the right one depends on your skin type and goals. As a result, understanding how these acids behave is essential for building a routine that works.

In this guide, we break down how each acid works, who it suits, and how often you should use it. Additionally, whether you’re dealing with dullness, congestion, texture or dryness, there’s an exfoliating acid that can help. For example, AHAs are often used for dullness, while BHAs are commonly chosen for congestion. Furthermore, choosing the right strength and frequency helps you avoid irritation while still getting visible results. In addition, selecting products that match your skin type can improve your overall results.

As you move through this guide, you’ll find clear explanations, safety tips and ingredient examples. Moreover, these insights can help you create a routine that is both effective and gentle. Ultimately, the goal is to exfoliate smarter, not harder. Therefore, your skin can become smoother, brighter and more balanced over time. In the end, consistency matters far more than intensity.

Exfoliation is one of the most transformative steps in skincare. However, it is also one of the most misunderstood. On the one hand, regular exfoliation can improve skin texture and clarity. On the other hand, over-exfoliation can damage the skin barrier. For this reason, finding the right balance is important. Consequently, this guide breaks down the four major exfoliating acid families: AHA, BHA, LHA and PHA. Furthermore, it explains what they do, who they are for and how to use them safely.

How Exfoliating Acids Work

Exfoliation removes dead skin cells from the surface or from inside the pores. As a result, skin can appear smoother and brighter. Depending on the acid, exfoliation can also reduce breakouts, fade pigmentation and improve hydration. In addition, some acids help strengthen the skin barrier over time. Likewise, regular exfoliation can enhance the effectiveness of other skincare products. Overall, the key is choosing the right acid for your skin type. Then, use it consistently rather than aggressively. Consequently, you can achieve healthier-looking skin while minimising irritation.

The Four Types of Exfoliating Acids

Glycolic Acid: Derived from sugar cane, it is one of the most popular AHAs used in skincare for its ability to penetrate the skin deeply and exfoliate effectively.
Lactic Acid: Found in sour milk and fermented products, lactic acid is known for its moisturising properties and gentle exfoliation.
Citric Acid: Sourced from citrus fruits, citric acid is often used to brighten the skin and improve texture.
Malic Acid: Present in apples, malic acid helps to exfoliate and improve skin hydration.
Tartaric Acid: Derived from grapes, tartaric acid is used in some skincare formulations for its antioxidant properties.

Best for: Dry, dull, textured, or sun‑damaged skin
How it works: AHAs are water‑soluble and exfoliate the surface of the skin. They dissolve the bonds between dead skin cells, revealing smoother, brighter skin.

Salicylic Acid: A type of mild acid found in plants, tree bark, fruit, and some dairy products it penetrates deep into pores to dissolve sebrum and dead skin cells.

Best for: Oily, acne‑prone, congested skin
How it works: BHAs are oil‑soluble, meaning they travel deep into pores to dissolve oil, debris, and dead skin. This makes them ideal for blackheads, breakouts, and ingrown hairs.

Capryloyl Salicylic Acid: A modified form of Salicylic acid created by combining it with Capryloyl a fatty acid derived from coconut oil.

Best for: Sensitive or reactive skin that still needs pore‑level exfoliation
How it works: LHA is a gentler, slow‑release derivative of salicylic acid. It penetrates gradually, offering controlled exfoliation with less irritation.

Benefits:

Very gentle pore exfoliation
Helps with breakouts
Suitable for sensitive skin
Supports smoother texture

Gluconolactone: Derived from gluconic acid which naturally occurs in fruits, horney and corn.

Lactobionic acid: Made from two sugars joined together — one from gluconic acid and one from galactose. You get it by oxidising lactose, the same sugar found in milk.

Best for: Sensitive, rosacea‑prone, or barrier‑compromised skin
How it works: PHAs have larger molecules, so they stay on the surface and exfoliate very gently. They also attract moisture, making them ideal for hydration‑focused routines.

Benefits:

Gentle exfoliation
Hydrating
Strengthens the skin barrier
Great for redness‑prone skin

Acid Type	Best For	How It Works	Strength
AHA	Dry, dull, textured skin	Surface exfoliation	Strongest surface action
BHA	Oily, acne‑prone, ingrown hairs	Deep pore exfoliation	Strongest pore action
LHA	Sensitive + acne‑prone	Slow‑release pore exfoliation	Gentle BHA alternative
PHA	Sensitive, reactive skin	Gentle surface exfoliation + hydration	Gentlest overall

How to Choose the Right Exfoliating Acid

For example, AHAs are ideal if your goal is to improve overall skin radiance and texture.

AHA for:

Glow
Smoother texture
Help with pigmentation
Anti‑ageing benefits

On the other hand, BHAs are better suited to oily or congestion-prone skin.

BHA for:

Clearer pores
Fewer blackheads
Less oiliness
Ingrown hair prevention

Similarly, LHAs provide many of the same benefits as BHAs but in a gentler way.

LHA for:

BHA‑like results with less irritation
A slow‑release, gentle exfoliant

Meanwhile, PHAs are the best choice for sensitive or easily irritated skin.

PHA for:

The gentlest exfoliation possible
Hydration + exfoliation in one
Barrier‑friendly resurfacing

How Often Should You Exfoliate?

In general, exfoliation should be adjusted according to your skin type and tolerance.

For instance:

AHA: 1–3 times per week
BHA: 2–4 times per week (or daily if tolerated)
LHA: Daily or every other day
PHA: Daily (very gentle)

Ultimately, consistency is more important than frequency. Therefore, it is best to start slowly and increase usage as your skin adapts. In addition, paying attention to signs of irritation can help you avoid over-exfoliation. As a result, you can enjoy smoother, healthier-looking skin while maintaining a strong skin barrier.

The complete Exfoliation Breakdown