The Ordinary’s AHA 30% + BHA 2% Peeling Solution burns because it contains a high concentration of free acids that actively dissolve the bonds between dead skin cells. That process disrupts your skin’s protective barrier, triggers nerve endings, and temporarily increases water loss from the skin’s surface. A mild stinging or warming sensation is normal. Intense, painful burning is not.
How the Acids Work on Your Skin
This product combines 30% alpha hydroxy acids (primarily glycolic and lactic acid) with 2% salicylic acid, a beta hydroxy acid. That’s a potent formula. The acids work by lowering the pH on your skin’s surface and breaking apart the “glue” that holds dead cells together. As those bonds dissolve, the acids also interact with nerve endings in your skin, producing the characteristic tingling or stinging feeling.
The burning sensation comes specifically from the disruption of your skin barrier. When that barrier is compromised, even temporarily, your skin loses moisture faster and becomes more sensitive to stimulation. Your nerves interpret this as stinging, warmth, or outright burning depending on how reactive your skin is and how intact your barrier was before you applied the product.
Normal Tingling vs. a Problem
Some degree of sensation is expected with any chemical peel. According to the Mayo Clinic, stinging and burning during a peel can last up to 20 minutes and still fall within the normal range. Mild redness afterward is also part of normal healing. What you’re feeling is the product doing its job.
The line between “working” and “too much” matters, though. If the burning feels sharp or intensifying rather than settling into a manageable tingle, that’s your skin telling you the acids are penetrating too aggressively. Watch for these warning signs:
- Pain that gets worse instead of leveling off in the first minute or two
- Visible swelling or welting beyond light pinkness
- Persistent redness or scabbing in the hours or days after use
- Skin turning noticeably darker or lighter in treated areas (a sign of pigmentation changes that chemical peels can cause)
If you experience any of these, you’ve moved past exfoliation into irritation or a mild chemical burn.
Why It Burns More for Some People
The intensity of the burn depends on the condition of your skin when you apply the product. Several factors make it sting significantly more:
A compromised skin barrier. If you’ve been using retinoids, other direct acids, or vitamin C products in the days before applying the peel, your barrier is already thinned. The Ordinary explicitly warns against combining this product with retinoids, direct vitamin C, peptides, and several other actives. Layering exfoliants is the most common reason people experience painful burning rather than mild tingling.
Broken or irritated skin. Any micro-tears, dry patches, active breakouts, or areas of peeling skin allow the acids to penetrate deeper than intended. The product is designed for use on unbroken skin only. Even something as minor as over-exfoliating with a washcloth earlier that day can make a difference.
Skin that’s new to acids. The Ordinary states this formula is only suitable for experienced users of acid exfoliation. If you’ve never used a glycolic or salicylic acid product before, jumping straight to a 30% concentration is like skipping the shallow end entirely. Your skin hasn’t built any tolerance, so the nerve response will be much stronger.
Leaving it on too long. The concentration, number of applications, and duration all affect how deeply acids penetrate, according to the FDA. The product has a maximum recommended wear time (typically 10 minutes). Going beyond that doesn’t give you better results. It gives you a chemical burn.
What to Do if It Burns Too Much
If the sensation crosses from uncomfortable to painful, wash it off immediately with plenty of warm water. Don’t wait out the full application time hoping it will calm down. Rinsing with water raises the pH on your skin and stops the acid from working within seconds.
If your skin still feels raw or “sour” after rinsing, that’s a sign the acids have impacted your barrier more than they should have. Some people use a very dilute baking soda solution (a pinch dissolved in water) to bring the skin’s pH back to neutral faster, then rinse again thoroughly with plain water. After that, apply a simple, fragrance-free moisturizer to support barrier recovery. Skip all other actives for several days.
How to Reduce the Burn Next Time
You don’t have to white-knuckle your way through this product. A few adjustments make the experience much more tolerable:
Start with a shorter application time. Even 3 to 5 minutes delivers meaningful exfoliation at this concentration. You can gradually work up as your skin builds tolerance over several weeks of use.
Clear your routine of other actives for 48 hours before and after using the peel. That means no retinol, no vitamin C serums, no other exfoliating acids, and none of the other products The Ordinary lists as incompatible. Your skin can only handle so much barrier disruption at once.
Apply to completely dry skin. Water on the surface can cause the product to spread unevenly and pool in creases or around the nose, creating hotspots of higher concentration. Pat your face fully dry after cleansing, wait a minute, then apply.
Use it no more than once or twice a week. More frequent use doesn’t speed up results. It just keeps your barrier in a perpetually weakened state, which makes every application burn more than it needs to and increases your risk of lasting irritation or pigmentation changes.