AHA vs. BHA vs. PHA: What Should Breakout-Prone Skin Check First on the Ingredient List?

Quick answer: AHA and BHA are names for families of acid ingredients, and the sources this guide checked give no basis for saying one family is better for breakout-prone skin by name alone. Before you choose, find the family name on the container’s ingredient list, check whether the product is rinse-off or leave-on and whether its amount is disclosed, and if it overlaps with products you already use, add only one new acid step. If stinging or redness lingers after you apply it, or painful, deep acne increases, consider seeing a dermatologist.

This guide is for people with breakout-prone or oily skin who are about to bring in their first product with acid ingredients and want to know what to check first when they find the names AHA, BHA, PHA, or LHA on a container’s ingredient list. It does not cover which ingredient has better research behind it, how far apart to space uses, how to read salicylic acid concentrations, combining products with prescription medication, or scrubs and peeling gels. This is a brand guide run by SKIN9HARI, and SKIN9HARI sells products that list acid ingredients. Product information is kept separately at the end of the guide.

In this guide, an “acid step” means any one product whose ingredient list includes at least one of the AHA, BHA, PHA, or LHA names in the table below (this guide’s own definition).

Can you choose between AHA and BHA by the name alone?

AHA (alpha hydroxy acid), BHA (beta hydroxy acid), PHA (polyhydroxy acid), and LHA are family names, and AHA alone covers several ingredients, such as glycolic acid and lactic acid (1996 glycolic acid and lactic acid cream study). So the words “a BHA product” don’t tell you which ingredient is in it, how much, or in what kind of formula. Instead of ranking the families, this guide lays out the order in which to check the label.

The properties known for each family should also be read ingredient by ingredient. Salicylic acid is described as lipid-soluble, unlike AHAs such as glycolic acid (2015 review of salicylic acid peels).

“SA is a lipid-soluble agent, in contrast with the α-hydroxy acids (such as glycolic acid), and is therefore miscible with epidermal lipids and sebaceous gland lipids in hair follicles.” — Arif T, Clinical, Cosmetic and Investigational Dermatology, 2015

That review covers peels performed by professionals, so this guide doesn’t carry it over to the results of a single bottle of skincare, and doesn’t stretch it into “AHAs are water-soluble” or “it gets deep into pores.” The same review also mentions the view that classifies salicylic acid as a phenolic aromatic acid, so in this guide “BHA” is used only as the common name for salicylic acid.

What names do AHA and BHA go by on an ingredient list?

Below is a table that pairs the four family names with how they appear on ingredient lists. It does not rank them or rate which skin types they suit. The two example columns show the ingredient listings of the 2026 renewed formulas of SKIN9HARI’s Revive Therapy A.C Cleanser and Revive Therapy N.F Cream.

Even if one product lists names from several families, count it as one acid step. The last row is there so you don’t miscount names by their ending alone, and it doesn’t judge what those ingredients do. If you note for each product in your routine whether it has a name from this table, you’ll have a baseline when you add just one new acid step.

An illustration of copying ingredient names from an ingredient list into a table on a notepad.

Does the same acid work differently in a rinse-off product than in a leave-on product?

A cleanser is washed with lather and rinsed off, while a cream is applied and left on, so even with the same family name, the time it stays on your skin is different from the start. That’s why, when you write AHA and BHA names into the table, you also write down the formula type.

That said, the sources this guide checked did not include any evidence comparing results between the two formula types, so we don’t conclude that one is better, or that “it rinses off, so it’s pointless.” The presence of an acid name also doesn’t mean that the product’s effects have been confirmed.

For how cleansers differ in pH and cleansing ingredients, see Low-pH vs. Alkaline Cleansers: Does pH Change How Well They Clean?

If the amount isn’t listed, how do you judge it?

An ingredient list names ingredients from the largest amount down, but ingredients used at 1% or less, fragrances, and colorants may be listed in any order (Korea’s cosmetics ingredient labeling explainer). So don’t calculate an amount from where an acid name sits on the list.

Read an amount as is only when a number is stated separately on the product page or the container, and if there’s none, write “amount not disclosed” (this guide’s suggestion).

If you already use a product with acids, what do you count first?

1. Find the names from the table in each product in your routine and write them down

Look for the names in the table on the ingredient list of each product you use now, write one line per product, and if a product has even one of the names, count it as one acid step.

2. Add only one new acid step

We suggest adding only one new acid step at a time and not changing two products in the same week (this guide’s suggestion). If you change several at once, you can’t tell which product caused what. If you’re using prescription acne medication, follow the instructions from where you got the prescription before you add an acid step.

3. Try a new product on a small area first

One documented method is to apply a new product to a small area twice a day for 7 to 10 days (How to test skin care products). If a reaction appears, gently wash the product off right away and don’t use it again (same guidance).

4. If it stings or turns red, drop the acid step first

“Be careful not to over-exfoliate, as this could lead to skin that is red and irritated.” — American Academy of Dermatology (AAD), How to safely exfoliate at home

If stinging, burning, or redness lingers after you apply it, drop the acid step first rather than pushing through to let your skin adjust (How to safely exfoliate at home). That guidance gives no number of times, so this guide doesn’t set an interval either.

An illustration of writing down the products you use one line at a time to count your acid steps.

For what to stop when your face is red and stinging, see Face Red and Stinging After Cleansing? A Sensitive-Skin Routine Checkup

When should you see a dermatologist instead of switching ingredients?

You don’t have to finish filling in the table before you get care. If any of the following apply, consider seeing a dermatologist first.

• Stinging or redness doesn’t settle down even after you drop the acid step.
• Your skin swells or oozes, and cool compresses or petroleum jelly don’t relieve it (How to test skin care products).
• Painful, deep acne increases, or scars start to form.
• The affected area spreads quickly, or it’s getting in the way of daily life.
• You’re pregnant or breastfeeding and unsure whether you can use products with acid ingredients (Acne care during pregnancy).

An illustration of looking into booking a medical appointment.

Related guides

• How Often Should You Exfoliate Breakout-Prone Skin?
• Salicylic Acid Concentration: How Do You Read the Different Numbers on Products?

FAQ

Is salicylic acid the same as BHA?

Salicylic acid on an ingredient list is the ingredient commonly called BHA. However, there is also a view that classifies salicylic acid as a phenolic aromatic acid rather than a beta hydroxy acid (2015 review of salicylic acid peels), so this guide uses “BHA” only as a common name. How to read concentrations is covered in the salicylic acid concentration guide under Related guides.

Is capryloyl salicylic acid an LHA?

Yes. Capryloyl salicylic acid (LHA) is described as a derivative of salicylic acid (2008 LHA peel comparison study), and it appears on ingredient lists as “Capryloyl Salicylic Acid.” You can’t tell from this name alone whether it suits sensitive skin better, so the first time you use it, watch your skin’s response in the same order as any other acid step.

Is PHA gentle enough to use every day?

The main PHA ingredient name is gluconolactone, and it is referred to as a polyhydroxy acid (2023 PHA serum study). The sources this guide checked did not include evidence comparing it as gentler than the other families, so we don’t say “it’s gentle, so use it every day.” For how often to use it, see the exfoliation frequency guide, and if it stings or turns red, drop the acid step first.

If a product contains both AHA and BHA, how many acid steps is that?

If one product lists names from several families together, count that product as one acid step (this guide’s definition). You can’t tell how much of each ingredient is in it from the order of the ingredient list (Korea’s cosmetics ingredient labeling explainer), so write down only amounts that are published as numbers. This guide doesn’t judge whether it’s fine to use alongside other acid steps.

Is there any point to AHA or BHA in a face wash you rinse off?

A rinse-off product is washed away and a leave-on product stays on, so the time each stays on your skin is different from the start. The sources this guide checked did not include evidence comparing results between the two formula types, so we don’t decide whether there is a point or not. Just keep in mind that an acid name in a cleanser doesn’t mean that product’s effects have been confirmed.

If an acid is listed near the end of the ingredient list, does that mean there’s only a little?

You can’t conclude that. Ingredients used at 1% or less, fragrances, and colorants may be listed in any order (Korea’s cosmetics ingredient labeling explainer), so don’t calculate an amount from its position. Read an amount only when a number is stated separately.

Can I keep using AHA or BHA if it stings and turns my skin red?

Rather than pushing through to let your skin adjust, drop that acid step first. Guidance notes that over-exfoliating can leave skin red and irritated (How to safely exfoliate at home). If it doesn’t settle down after you drop it, consider getting care, as in the last question.

I already use a product with acids. Can I add another one?

First count the acid steps in your current routine using the table, and we suggest keeping any new acid step to just one (this guide’s suggestion). One documented method is to apply a new product to a small area twice a day for 7 to 10 days (How to test skin care products). This guide doesn’t decide whether layering them is fine.

Can you use AHA, BHA, PHA, or LHA while pregnant or breastfeeding?

The sources this guide checked can’t settle the safety of acid ingredients as a whole. The AAD’s guidance on acne during pregnancy says to talk with your obstetrician or dermatologist before use, even for products you can buy without a prescription (Acne care during pregnancy). That guidance refers to salicylic acid in those nonprescription products. Take the ingredient list of the product you want to use and ask a medical provider first.

Should I see a doctor if I get swelling or hives after using a product?

If a reaction appears after you apply a product, gently wash it off right away and don’t use that product again. If the reaction is severe and cool compresses or petroleum jelly don’t relieve it, you may need to see a dermatologist (How to test skin care products). Getting it examined to find out what it is comes before waiting it out.

In one sentence

Find AHA and BHA by their ingredient list names rather than their family names, write them down with the formula type and any published amount, add only one new step if you already use an acid step, drop that step first if it stings or turns red, and consider seeing a dermatologist if it doesn’t settle down.

SKIN9HARI products we recommend for this concern

If you want to find AHA and BHA names on real labels and fill in the table, SKIN9HARI recommends the Revive Therapy A.C Cleanser and the Revive Therapy N.F Cream. There are three reasons.

• One is a rinse-off, mildly alkaline foam cleanser and the other is a cream you apply as the last step of your routine, so you can copy the two example columns of the table as they are.
• Their full ingredient lists are published, so you can sort acid names from other names that end in “acid” yourself. Neither product is a functional cosmetic under Korean regulations; both are general cosmetics.
• Both products are irritation patch-tested (finished-product 24-hour occlusive patch test). That test looked at primary skin irritation; it did not test use alongside other acid products, and it did not test effects.

Clinical study (finished product) of primary skin irritation (24-hour occlusive patch) | Testing institution: Korea Dermatology Research Institute Co., Ltd. | Report No.: KDRI-2019-052-F2 | Study period: February 19–22, 2019 | Participants: 30 | Individual results may vary

Clinical study (finished product) of primary skin irritation (24-hour occlusive patch) | Testing institution: Korea Dermatology Research Institute Co., Ltd. | Report No.: KDRI-2019-052-F1 | Study period: December 28, 2018–March 6, 2019 | Participants: 30 adults | Individual results may vary

How to use them for this concern. Don’t bring in both products at once; start with one. Use the A.C Cleanser for cleansing, the first step of skincare, and the N.F Cream after the ampoule as the last step of your routine. Write each product you bring in as one line in the table, and add the other only after the first has gone by without stinging or redness. If fragrance listings concern you, note first that the A.C Cleanser lists fragrance.

If any of the signs for getting care above apply to you, seeing a dermatologist comes before products. Results may not be the same for every skin type. Product information is on the Revive Therapy A.C Cleanser product page and the Revive Therapy N.F Cream product page.

Sources

1. Arif T. Salicylic acid as a peeling agent: a comprehensive review. Clinical, Cosmetic and Investigational Dermatology, 2015.
2. Oresajo C, et al. Comparison of a capryloyl salicylic acid (LHA) peel and a glycolic acid peel. Journal of Cosmetic Dermatology, 2008.
3. Gentili G, et al. Use test of a PHA complex serum on sensitive skin. Journal of Cosmetic Dermatology, 2023.
4. Stiller MJ, et al. Comparison study of 8% glycolic acid and 8% lactic acid creams. Archives of Dermatology, 1996.
5. American Academy of Dermatology (AAD). How to safely exfoliate at home.
6. American Academy of Dermatology (AAD). How to test skin care products.
7. American Academy of Dermatology (AAD). Acne care during pregnancy.
8. Ministry of Government Legislation (Korea), Easy-to-Find Legal Information. Cosmetics labeling — order of the full ingredient list. In Korean.

This guide is general skincare information, not medical advice. SKIN9HARI products are cosmetics and are not intended to diagnose, treat, cure, or prevent any disease. If a skin problem is painful, spreading, or persistent, see a dermatologist.