Quick Answer
To use AHA and BHA, cleanse your face, apply an appropriate exfoliant according to its label, and follow with moisturizer. Start with one acid rather than both, use it on a limited number of days, and increase only if your skin tolerates it. Apply broad-spectrum SPF 30 or higher during the day, especially when using AHA.
A BEGINNER-FRIENDLY EXFOLIATION GUIDE
Build a Skincare Routine That Respects Your Skin
Chemical exfoliation can sound complicated when skincare labels mention glycolic acid, lactic acid, salicylic acid, and different product strengths. The good news is that you do not need an elaborate routine to understand these ingredients.
Learning how to use AHA and BHA starts with understanding what each ingredient does, choosing the right product for your needs, and introducing it gradually. This guide explains the process, common mistakes, and practical ways to make exfoliation part of a balanced skincare routine.
BHA basics
Layering order
Skin safety
Key Takeaways
- AHA mainly exfoliates the skin’s surface, while BHA can work inside oil-filled pores.
- You do not need both acids to build an effective skincare routine.
- Beginners should introduce one exfoliating product at a time.
- Moisturizer and consistent sun protection are important parts of an exfoliation routine.
Understanding AHA and BHA Before You Start
AHA and BHA are two categories of chemical exfoliating ingredients. They help loosen the connections between dead skin cells so that those cells can shed from the skin’s surface.
Although they share an exfoliating purpose, they have different properties. Understanding those differences helps you choose a product without adding unnecessary steps to your routine.
What Is AHA?
AHA stands for alpha hydroxy acid. These water-soluble acids are commonly used in skincare products designed to exfoliate the outer surface of the skin.
Common examples include:
- Glycolic acid: A commonly used AHA with a relatively small molecular size.
- Lactic acid: Another popular AHA that is often included in products designed for gentler exfoliation.
- Mandelic acid: An AHA with a larger molecular size than glycolic acid, often found in exfoliating skincare formulas.
People often explore AHA products when they want to address the appearance of dullness, uneven-looking texture, or visible discoloration. Individual results depend on the formulation, concentration, skin characteristics, and consistency of use.
What Is BHA?
BHA stands for beta hydroxy acid. Salicylic acid is the best-known BHA used in skincare.
Unlike water-soluble AHAs, salicylic acid is oil-soluble. This property allows it to move through oily material in pores, making it a common ingredient in products designed for clogged pores, blackheads, and blemish-prone skin.
It may be useful for people who experience oily skin or recurring clogged pores. However, it can still cause dryness, redness, or irritation, particularly when used too frequently.
AHA vs. BHA: What Is the Difference?
The easiest way to understand the difference is to consider where each ingredient is commonly used and the type of skincare concern it may suit.
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| Feature | AHA | BHA |
|---|---|---|
| Solubility | Water-soluble | Oil-soluble |
| Common ingredient | Glycolic or lactic acid | Salicylic acid |
| Main area of action | Skin surface | Skin surface and oily pores |
| Common skincare interest | Dullness and uneven texture | Clogged pores and oily skin |
| Possible concern | Irritation and sun sensitivity | Dryness and irritation |
Neither ingredient is automatically better. The more suitable choice depends on your skin’s needs and how comfortably it tolerates exfoliation.
How to Use AHA and BHA Step by Step
A simple routine is generally easier to maintain than a collection of strong active ingredients. Start with one exfoliating product and give your skin time to adjust.
Your Basic Exfoliation Sequence
STEP 1
Cleanse
Remove daily buildup.
STEP 2
Exfoliate
Apply one suitable acid.
STEP 3
Moisturize
Support skin comfort.
STEP 4
Protect
Use daytime sunscreen.
This is a general routine framework. Follow the specific product’s instructions, including whether it needs rinsing.
Step 1: Cleanse Your Face Gently
Begin with a gentle cleanser that removes dirt, sunscreen, makeup, and excess oil without leaving your skin feeling tight or uncomfortable.
Use lukewarm water and avoid aggressive scrubbing. Pat your face dry with a clean towel rather than rubbing it.
If your skin is already irritated, peeling, or unusually dry, postpone exfoliation until it feels comfortable again.
Step 2: Apply Your Chosen Exfoliant
Choose either an AHA or a BHA product based on your main skincare concern. Apply it according to the label, using the recommended amount and avoiding sensitive areas such as the eyes and lips unless the product specifically permits use there.
Some exfoliants are leave-on serums or toners, while others are wash-off treatments. Do not assume every formula should stay on your face for the same amount of time.
For a beginner, a lower-strength, clearly labeled product intended for home use is a sensible starting point. Avoid choosing a product simply because it advertises a high acid percentage.
Step 3: Use Moisturizer
After applying the exfoliant as directed, use a moisturizer that suits your skin. A simple formula containing ingredients such as glycerin or ceramides may help support hydration and skin comfort.
You do not need several serums after exfoliating. Keeping the rest of your routine simple makes it easier to identify which product may be causing a reaction.
Step 4: Apply Sunscreen During the Day
Sun protection is particularly important when using AHA products. The FDA warns that topical AHAs may increase skin sensitivity to sunlight and the possibility of sunburn during use and for up to a week after stopping.
Use a broad-spectrum sunscreen with SPF 30 or higher, following its application and reapplication instructions. Protective clothing, shade, and limiting excessive sun exposure can provide additional protection.
AHA-containing products deserve particular attention because of potential sun sensitivity. Do not skip sunscreen simply because you apply your exfoliant at night. Continue sun-protection measures while using AHA and for one week after discontinuing it.
How Often Should You Use AHA and BHA?
There is no single exfoliation schedule that works for everyone. The appropriate frequency depends on the specific acid, product formulation, concentration, skin condition, and instructions provided by the manufacturer.
Rather than starting with frequent applications, begin conservatively. For a beginner using a leave-on exfoliant, an occasional application, such as once weekly, can be a cautious way to assess tolerance when consistent with the product label.
If your skin remains comfortable, you can consider adjusting the frequency according to the instructions. More frequent application is not automatically better.
An Illustrative Beginner Schedule
The following is an example of how someone might organize a routine while introducing one exfoliating product. It is not a universal prescription or a requirement to increase use.
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| Routine stage | Possible approach | What to monitor |
|---|---|---|
| Introduction | One product on an occasional evening | Redness, dryness, stinging |
| Observation | Keep the remaining routine simple | Skin comfort between uses |
| Adjustment | Change frequency only if appropriate | Persistent dryness or irritation |
| Maintenance | Use the lowest comfortable frequency | Ongoing tolerance and skin condition |
There is no need to move to daily exfoliation. If the product causes ongoing irritation, reduce use or stop rather than trying to push through the reaction.
A Simple Skin-Tolerance Check
No persistent discomfort. Continue following the label and monitor your skin.
Pause exfoliation and focus on gentle cleansing and moisturizer.
Stop using the product. Seek medical guidance if the reaction is significant or persistent.
Can You Use AHA and BHA Together?
Yes, some skincare routines and formulated products contain both AHA and BHA. However, using both ingredients in separate products at the same time is not necessary for everyone.
Combining exfoliating acids can increase the likelihood of dryness, irritation, and skin discomfort. This is especially important for beginners or people who already use other active skincare ingredients.
A more cautious approach is to introduce one acid first. If you later decide that both ingredients fit your routine, consider separating their use into different evenings rather than immediately layering them.
Three Ways to Organize Both Ingredients
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| Approach | How it works | Consideration |
|---|---|---|
| AHA only | Use one AHA exfoliant as directed | A simpler starting point |
| BHA only | Use one BHA exfoliant as directed | Often considered for oily or clogged pores |
| Alternating days | Use different acids on separate evenings | Still requires careful frequency management |
| Combined formula | Use a product formulated with both acids | Follow its specific directions |
Layering two separate acids in one session can be unnecessarily irritating. If you have sensitive skin, persistent acne, or an existing treatment routine, ask a dermatologist before combining exfoliants.
Which Exfoliant Should You Consider?
SURFACE EXFOLIATION
Consider AHA
If your main interest is dull-looking skin or uneven surface texture.
PORE-RELATED CONCERNS
Consider BHA
If your main interest is oily skin or the appearance of clogged pores.
These are general ingredient-selection guidelines, not a diagnosis or a guarantee of results.
What Products Can You Use Alongside AHA and BHA?
When adding chemical exfoliants, it helps to make the other products in your routine simple and predictable. You do not need a large collection of skincare products.
Helpful Product Categories
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| Product type | Purpose | What to consider |
|---|---|---|
| Gentle cleanser | Removes everyday buildup | Avoid harsh scrubbing |
| Basic moisturizer | Supports hydration | Consider fragrance-free formulas |
| Broad-spectrum sunscreen | Protects against UVA and UVB | Choose SPF 30 or higher |
| Hydrating serum | Adds hydration | Choose a simple, well-tolerated formula |
| Barrier-support moisturizer | Supports skin comfort | Look for ingredients such as ceramides |
Hydrating ingredients such as glycerin and hyaluronic acid are often used alongside exfoliating products. However, even products marketed as gentle can cause reactions in some individuals.
Ingredients That Require Extra Planning
Some skincare ingredients can add to irritation when used alongside exfoliating acids. Retinoids, other exfoliating acids, strong physical scrubs, and certain acne treatments deserve particular attention.
If you already use prescription skin medication or multiple active ingredients, ask your dermatologist or prescribing professional how to organize your routine. Do not discontinue prescribed treatment without discussing it with the prescriber.
Keep Your Routine Balanced
Gentle cleanser, moisturizer, and sunscreen.
One new exfoliating product at a time.
Retinoids, prescription treatments, and other exfoliants.
Common AHA and BHA Mistakes to Avoid
Many problems with chemical exfoliation happen because people introduce too many active ingredients or increase product use too quickly.
Using Too Much Product
Applying extra exfoliant does not guarantee better results. Use the amount directed on the packaging and avoid repeated applications in an attempt to speed up the process.
Combining Too Many Active Ingredients
Using AHA, BHA, retinol, and strong acne treatments together may increase irritation. Introduce products separately and seek professional guidance if you are unsure whether they can be combined.
Ignoring Skin Discomfort
Persistent burning, redness, swelling, peeling, or tenderness should not be treated as proof that an exfoliant is working. Stop using the product if an uncomfortable reaction develops.
Skipping Sunscreen
AHA use requires attention to sun exposure. Even if you apply your exfoliant in the evening, daytime sun protection remains important.
Using Exfoliants on Damaged Skin
Avoid applying exfoliating acids to open wounds, sunburned skin, or areas that are already inflamed or severely irritated. Wait until the skin has recovered and seek professional advice when necessary.
Common Problems and Better Next Steps
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| Problem | Possible reason | Practical next step |
|---|---|---|
| Dryness | Frequent exfoliation | Pause and simplify the routine |
| Stinging | Irritation or a product reaction | Stop the product and assess the reaction |
| Peeling | Excessive exfoliation or irritation | Stop exfoliating until comfortable |
| Increased redness | Sensitivity or irritation | Avoid additional active ingredients |
| Sunburn | UV exposure and inadequate protection | Stop exfoliation and seek advice if significant |
Stop using an exfoliating product if you develop significant burning, swelling, blistering, or a worsening rash. Rinse off a product if its instructions or a reaction indicate that it should be removed. Seek medical care for severe, persistent, or concerning symptoms, especially if you experience eye involvement or signs of an allergic reaction.
Your Pre-Application Checklist
- My skin is not sunburned, broken, or severely irritated.
- I know whether my product is AHA or BHA.
- I have read the product’s instructions.
- I am not introducing several new active ingredients together.
- I have a suitable moisturizer and daytime sunscreen.
- I know when to stop if irritation develops.
Who Should Be Extra Careful With Chemical Exfoliants?
Although many over-the-counter exfoliating products are intended for home use, they are not suitable for every person or every skin condition.
People with eczema, rosacea, very sensitive skin, active skin inflammation, or a damaged skin barrier may experience additional irritation. Those with persistent acne or unexplained skin changes may also benefit from a dermatologist’s assessment rather than experimenting with multiple acids.
Anyone using prescription acne treatments, retinoids, or other medications that affect the skin should check with the prescribing professional before introducing exfoliating acids.
Professional chemical peels are different from ordinary at-home exfoliating products. Stronger peels should not be treated as interchangeable with everyday skincare serums or toners.
When to Contact a Dermatologist
Consider professional guidance if you experience repeated irritation, persistent redness, worsening breakouts, unusual pigmentation changes, or discomfort that does not settle after stopping the product.
Seek prompt medical attention for severe swelling, blistering, significant pain, or a serious allergic reaction. If a product gets into your eyes, follow its rinsing instructions and seek medical advice if irritation continues.
Frequently Asked Questions
Should I use AHA or BHA first?
Neither ingredient has to come first in every routine. Choose one based on your skincare needs. AHA is commonly used for surface exfoliation, while BHA is often selected for oily or clogged pores. Beginners should start with one rather than introducing both at once.
Can I use AHA and BHA on the same day?
Some products are specifically formulated with both ingredients, but combining separate exfoliants in one session may increase irritation. Beginners should use one product first. If you want to introduce both, consider alternating days and ask a dermatologist if your skin is sensitive or you use other active treatments.
Should I use AHA and BHA in the morning or at night?
Many people prefer using exfoliating acids in the evening because it makes their routine easier to organize. However, the appropriate timing depends on the product directions. AHA users should maintain daytime sun protection regardless of when the exfoliant is applied.
Do I need moisturizer after using AHA or BHA?
A moisturizer is a useful part of an exfoliation routine because it helps maintain hydration and skin comfort. Choose a formula your skin tolerates, and keep the rest of your routine simple when introducing an exfoliant.
Can sensitive skin use AHA and BHA?
Some people with sensitive skin may tolerate certain exfoliating products, but reactions are possible. Avoid exfoliating already irritated or damaged skin. Consider speaking with a dermatologist before choosing an acid or beginning a new routine.
How long should I leave AHA or BHA on my face?
It depends on the product. Some are designed to remain on the skin, while others are rinse-off treatments. Always follow the manufacturer’s directions rather than applying a universal waiting time.
Can I use AHA and BHA every day?
Daily use is not necessary for everyone and may cause irritation. Follow the product’s recommended frequency and start conservatively. If dryness, redness, or discomfort develops, stop or reduce use and seek professional guidance when needed.
Final Thoughts
Learning how to use AHA and BHA does not require an expensive or complicated skincare routine. The most important decision is choosing an exfoliating ingredient that matches your needs and introducing it at a pace your skin can tolerate.
Start with one product, follow its instructions, use a suitable moisturizer, and maintain consistent sun protection. You can consider additional exfoliating products later, but combining more active ingredients is not automatically better.
Pay attention to changes in your skin rather than chasing a particular exfoliation schedule. If irritation persists, your skin condition worsens, or you are unsure whether an ingredient is appropriate, consult a qualified dermatologist. A simple, comfortable routine is a better foundation than aggressive exfoliation.
Author
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I'm Olivia Bennett, a skincare enthusiast and personal care content specialist at Remedytip. I have spent years researching skincare practices, exploring different skin concerns, and creating practical, easy-to-follow skincare guidance.
Through my work at Remedytip, I focus on producing informative skincare articles, exploring effective skincare practices, and helping readers better understand their skin. I enjoy sharing evidence-informed tips and practical advice to help people make informed skincare decisions. My goal is to simplify skincare and encourage healthy, consistent skincare habits for everyone.
