A peeling solution is a liquid skincare product containing concentrated acids that dissolve dead skin cells from the surface of your face. It works by breaking the bonds holding old, dull cells together so they shed more easily, revealing fresher skin underneath. Most peeling solutions you’ll find at beauty retailers contain some combination of alpha-hydroxy acids (AHAs) and beta-hydroxy acids (BHAs) at concentrations designed to exfoliate without requiring a dermatologist’s supervision.
How Peeling Solutions Work on Skin
Your skin constantly produces new cells that push older ones to the surface, where they eventually flake off. Sometimes that turnover slows down, leaving a buildup of dead cells that makes skin look rough, uneven, or dull. A peeling solution speeds up removal of that outer layer through a process called chemoexfoliation: the acids loosen the tiny protein bridges (called desmosomes) that hold skin cells to each other. Once those connections dissolve, dead cells release and rinse away.
This isn’t just cosmetic housekeeping. By clearing that top layer, peeling solutions also help other skincare products absorb more effectively. Topical acne treatments, for example, penetrate more efficiently into skin that’s been chemically exfoliated.
Types of Acids in Peeling Solutions
Most peeling solutions rely on two families of acids, and they behave differently because of how they interact with skin and oil.
Alpha-hydroxy acids (AHAs) are water-soluble and work on the skin’s surface. The most common are glycolic acid and lactic acid, though you’ll also see mandelic acid, citric acid, and tartaric acid on ingredient lists. Glycolic acid has the smallest molecular weight of all AHAs, which means it penetrates most easily and tends to produce the most noticeable exfoliation. Lactic acid is slightly gentler and also has mild hydrating properties. AHAs are the go-to for dullness, fine lines, uneven tone, and sun damage.
Beta-hydroxy acid (BHA) almost always means salicylic acid. Unlike AHAs, salicylic acid is oil-soluble, so it can cut through the sebum inside your pores and exfoliate both the surface and the pore lining. That makes it especially useful for acne-prone or oily skin. Despite being a stronger-sounding concept, BHA is generally considered milder than AHAs because of its larger molecular size.
Many popular products combine both. The Ordinary’s well-known AHA 30% + BHA 2% Peeling Solution, for instance, blends glycolic and lactic acids with salicylic acid in a single formula, targeting surface texture and pore congestion at the same time.
What Peeling Solutions Can Improve
With consistent use, peeling solutions address a surprisingly wide range of skin concerns. Fine wrinkles, uneven skin tone, mild acne, dryness, and post-acne dark spots all respond to regular chemical exfoliation. Results from light, at-home-level peels are subtle at first but build with repeated treatments. Over time, skin texture becomes noticeably smoother and tone becomes more even.
For darker skin tones specifically, salicylic acid peels have shown strong results for both active acne and the dark marks (post-inflammatory hyperpigmentation) that acne leaves behind. One study found that a series of five salicylic acid peels produced moderate-to-significant improvement in the majority of patients with deeper skin tones. Lactic acid peels have also demonstrated significant improvement in conditions like melasma, a common form of stubborn facial pigmentation.
The key difference between at-home and professional results comes down to depth. Over-the-counter peeling solutions only affect the outermost layer of skin (the epidermis). Professional peels performed by dermatologists use higher concentrations and stronger agents that can penetrate into the middle layer of skin (the dermis), producing more dramatic results for deeper wrinkles, scars, and significant sun damage.
Concentration Limits for Home Use
There’s a reason the peeling solution on your bathroom shelf doesn’t match what a dermatologist uses. Safety guidelines from the Cosmetic Ingredient Review Expert Panel, referenced by the FDA, set clear boundaries: glycolic and lactic acids in consumer products should stay at 10% or below, with a formula pH of 3.5 or higher. Salon products applied by trained professionals can go up to 30% concentration at a pH of 3.0, but only for brief application followed by thorough rinsing.
Products like The Ordinary’s 30% AHA solution sit at the upper edge of what’s available without a prescription. They’re formulated for very short contact times, not extended wear, and the instructions reflect that boundary carefully.
How to Apply a Peeling Solution Safely
If you’ve never used a peeling solution before, a patch test is non-negotiable. Apply a small amount behind your ear or on your inner wrist, leave it for 10 minutes, then rinse. If redness, stinging, or irritation develops, the product is too strong for your skin.
For actual use, the steps are straightforward:
- Cleanse and dry completely. Applying acid to wet skin increases irritation because water can drive the acid deeper and faster than intended.
- Apply a thin, even layer across your face and neck, avoiding the eye area and any broken or irritated skin.
- Time it carefully. For your first use, leave it on for no more than 5 minutes. You can gradually work up to 10 minutes as your skin builds tolerance. Never exceed the maximum time listed on your product.
- Rinse with lukewarm water. No scrubbing, no hot water. Pat dry gently.
Most peeling solutions are designed for once-a-week use. Using them more frequently doesn’t speed up results; it damages your skin barrier and causes the very redness and flaking you’re trying to fix.
Post-Peel Care
After using a peeling solution, your skin has lost its outermost protective layer and enters a brief healing phase. What you put on it during that window matters as much as the peel itself. Stick to a gentle, fragrance-free cleanser for the next day or two. Layer on hydrating, soothing ingredients: aloe vera, centella asiatica, or a simple barrier-repair moisturizer.
Sunscreen is critical. Freshly exfoliated skin is significantly more vulnerable to UV damage, and skipping sun protection can actually worsen the pigmentation issues you were trying to fix. A broad-spectrum SPF 30 or higher should go on every morning for at least a week after your peel, though daily sunscreen use is ideal regardless. AHA products in particular are known to increase sun sensitivity.
Avoid layering other active ingredients (retinol, vitamin C serums, additional exfoliants) on the same day you use a peeling solution. Your skin doesn’t need more stimulation while it’s recovering.
Who Should Avoid Peeling Solutions
Peeling solutions aren’t suitable for everyone. You should skip them entirely if you have active skin infections, open cuts or wounds on your face, or a known allergy to any of the acids in the formula. People currently taking isotretinoin (or who have used it within the past six months) face a higher risk of adverse reactions because the medication thins the skin and impairs its ability to heal normally.
If you have eczema, psoriasis, rosacea, or a connective tissue condition, chemical exfoliation can trigger flares. Darker skin tones (Fitzpatrick types III through VI) aren’t excluded from peeling solutions, but they carry a higher risk of post-inflammatory hyperpigmentation, the very dark spots that can form when skin is irritated. Starting with lower concentrations, shorter contact times, and salicylic acid-based formulas (which have a better safety profile for deeper skin tones) helps reduce that risk.
Pregnancy and breastfeeding are also standard contraindications for medium and deeper peels, and many dermatologists recommend caution even with lighter at-home formulas during that time.