A chemical peel uses an acid solution to remove the top layers of skin, revealing fresher, smoother skin underneath. Whether done at home or in a dermatologist’s office, the process follows the same basic sequence: prep the skin over several weeks, apply an acid for a controlled amount of time, neutralize it, and follow a strict aftercare routine while your skin heals. The depth of the peel you choose determines how dramatic the results are and how long recovery takes.
Choosing the Right Type of Peel
Chemical peels fall into three depth categories, and the acid you use determines which category you’re in. Light (superficial) peels use alpha hydroxy acids like glycolic, lactic, or mandelic acid, or beta hydroxy acids like salicylic acid. These target the outermost layer of skin and are the only type safe for home use. Medium-depth peels use trichloroacetic acid (TCA) and penetrate deeper, producing more visible results but requiring more downtime. Deep peels use phenol and should only ever be performed by a dermatologist.
For at-home peels, you’ll typically start with something like a 15% mandelic acid peel or a 20% salicylic acid gel peel. Lactic acid peels in the 40% to 50% range are also available for home use. The key number to check on any product is the pH: look for a pH around 2.0. At that level, the full percentage of acid in the product is “free” to exfoliate your skin. A higher pH means weaker exfoliation regardless of the acid percentage listed on the label.
Preparing Your Skin in Advance
The work starts two to four weeks before the actual peel. This pretreatment phase has two goals: thinning the outermost barrier of dead skin cells so the peel penetrates evenly, and reducing the risk of dark spots forming afterward. You can use a retinol product, a low-concentration glycolic or lactic acid, or azelaic acid during this window. Using a retinol cream (even a mild one) for two weeks before the peel has been shown to significantly speed up healing afterward.
Sunscreen is non-negotiable during this phase. Use a broad-spectrum SPF 30 or higher every day. Sun-damaged skin reacts unpredictably to chemical peels, and UV exposure in the weeks before a peel increases the chance of uneven pigmentation. If you have darker skin (Fitzpatrick types III through VI), talk to a dermatologist before attempting any peel, as the risk of post-inflammatory hyperpigmentation is higher.
Patch Testing First
Before applying any peel to your full face, test it on a small, discreet area of skin. The inside of your wrist or behind your ear works well. Apply a small amount of the peel solution, leave it on for the minimum recommended time, then neutralize and rinse. Wait at least 48 hours and watch for signs of an allergic reaction: excessive redness, swelling, blistering, or a rash. If none appear, you can proceed with the full application.
Step-by-Step Application
Start by washing your face with a gentle cleanser to remove all makeup, oil, and residue. Some peel kits include a pre-peel solution that further degreases the skin and ensures the acid absorbs evenly. Pat dry completely.
Apply the acid solution in a thin, even layer using a fan brush, gauze pad, or the applicator included with the product. Avoid the eye area, nostrils, and corners of the mouth. For your first session with any new peel, leave it on for just 30 seconds. You’ll feel tingling or warmth, which is normal. Stinging that becomes genuinely painful is your signal to neutralize immediately.
With each subsequent session (spaced at least two weeks apart), increase the time by 30-second increments. The maximum you should leave a superficial peel on is five minutes. If you’ve worked up to five minutes and feel like you need stronger results, move up to the next percentage of acid rather than extending the time. For example, graduate from a 15% mandelic peel to a 25% one, and start the timing process over from 30 seconds.
How to Neutralize the Peel
Some peels, particularly those with glycolic acid and TCA, need to be actively neutralized to stop the acid from continuing to work. You can make a simple neutralizing solution at home: mix two tablespoons of fresh baking soda into one and a half cups of water. Apply it to your face with a cotton pad or spray bottle, then rinse thoroughly with cool water.
Salicylic acid peels are a bit different. As the solution dries, you may see a white film form on your skin. This is pseudo-frosting caused by the acid crystallizing, not actual skin injury. It rinses off with water. Some lactic acid peels are also self-neutralizing and only require rinsing. Always check the instructions for your specific product.
What Frosting Means
With medium-depth peels (particularly TCA), the skin can turn white during application. This is called frosting, and it happens when the acid breaks down proteins in the skin, similar to how egg whites turn white when cooked. Light, patchy frosting indicates a superficial effect. Uniform white frosting with a pink undertone signals medium-depth penetration. Dense, solid white frosting means deep injury and significantly more downtime.
When frosting appears, you stop applying. Pushing past that point risks burns and scarring. If you see gray, yellow, or brown tones in the frost, or if frost appears almost instantly with visible drip marks, the peel has gone too deep. Rinse and neutralize immediately. This is one of the core reasons medium and deep peels belong in a clinical setting.
Recovery Day by Day
For a superficial peel, recovery is mild. You’ll have some redness and slight tightness for a day or two, followed by light flaking. A medium-depth peel follows a more dramatic timeline:
Day 1: Redness, tingling, and a sensation similar to a sunburn. Stay out of direct sunlight.
Day 2: Skin feels dry and tight. Redness persists.
Day 3: Flaking begins, usually starting around the mouth and spreading outward toward the jawline and hairline.
Days 4 through 7: This is the most intense peeling phase. Larger flakes come off. Do not pick or pull at them, as forcing skin off before it’s ready can cause scarring or infection.
Week 2: Peeling tapers off. Once all flaking stops, you can return to your normal skincare routine and wear makeup again.
Week 3 onward: The new skin underneath is smoother, more even-toned, and visibly brighter.
Aftercare That Matters
For at least five to seven days after a peel, stop using retinol, vitamin C serums, any products containing AHAs or BHAs, and physical exfoliants. Your fresh skin layer cannot handle active ingredients yet. Stick to a gentle cleanser and a fragrance-free moisturizer.
Avoid direct sunlight for seven to ten days. Wear a broad-spectrum SPF 30 or higher every single day, even if you’re mostly indoors. Post-peel skin is dramatically more vulnerable to UV damage, and sun exposure during this window is the fastest route to dark spots that are harder to treat than whatever you were trying to fix with the peel in the first place.
Don’t exercise heavily for the first 48 hours. Sweat irritates freshly peeled skin and can introduce bacteria. Avoid swimming pools, saunas, and hot showers during the first week.
Who Should Not Do a Chemical Peel
Certain conditions and medications make chemical peels unsafe. If you’re currently taking or have taken isotretinoin (commonly known by the brand name Accutane) within the past six months, peels are off the table. Isotretinoin thins the skin dramatically and a peel on top of that can cause serious injury. Pregnancy and breastfeeding also rule out medium and deep peels.
Other contraindications include active skin infections, open wounds in the treatment area, eczema or psoriasis flares, a history of keloid scarring, uncontrolled diabetes, and any condition that impairs wound healing. If you’re on long-term corticosteroids or immunosuppressive medications, your skin’s ability to recover is compromised. People who smoke also heal significantly more slowly and face higher complication risks.