Chemical Peels 101: Types, Downtime, and Who They Suit
A chemical peel applies an acid solution to accelerate the shedding of the outer skin layers, which prompts the skin underneath to renew. Superficial peels work on texture, congestion, and dullness with little to no visible peeling. Medium depth peels reach further, address stubborn pigmentation and scarring, and come with real downtime. Most visible results come from a course of four to six superficial peels spaced two to four weeks apart, not from one session.
Autumn is when I book most of mine, and there is a clinical reason for that rather than a marketing one. I will come back to it.
Peels are the treatment I have seen transform more skin than anything else in my years of practice. They are also the treatment I have seen go wrong most often, and almost always for the same reason.
The acid does less than the practitioner
People shop for peels by name. They ask for a glycolic, or a TCA, or whatever a friend had.
That is the wrong variable. The same acid at the same percentage produces completely different results depending on the pH of the formulation, how many layers go on, how long it stays on, what your skin has been exposed to in the previous fortnight, and whether the practitioner is watching your skin or watching the clock.
There is no magic percentage that makes a peel safe or unsafe. A 30 percent solution is not automatically gentle and a 50 percent solution is not automatically aggressive. Depth of action is what matters, and depth is a judgment call made in the room.
Which is why the question to ask is not “what peel do you use” but “why this one for me.”
The acids, and what each one is for
Glycolic acid is the smallest molecule of the alpha hydroxy acids, so it penetrates most readily. Good for texture, dullness, and fine lines. Also the one most likely to sting and, on reactive skin, to overshoot.
Lactic acid is larger and gentler, and it is hydrating in a way glycolic is not. My default for anyone with a compromised barrier, anyone new to peels, and often for deeper skin tones where I want to build slowly.
Mandelic acid has the largest molecule of the common AHAs, which makes it the slowest and most forgiving. Well tolerated on darker skin and useful for acne alongside pigmentation.
Salicylic acid is a beta hydroxy acid, meaning it is oil soluble, so it gets into the pore rather than working across the surface. This is the acne one. If your problem is congestion and blackheads rather than tone, this is usually the answer.
TCA is trichloroacetic acid, and at meaningful strengths it reaches the dermis. This is medium depth work. In California, where I practise, medium and deep peels sit outside the esthetics scope of practice because they intentionally destroy living tissue, which makes them a medical procedure. Your state may differ, and that is a question worth asking rather than assuming.
Jessner and other combination solutions layer acids to reach further than any single one would alone.
What each depth actually does
Superficial peels act on the epidermis. Expect mild flaking for two to three days, and often no visible peeling at all despite the name. Good for texture, dullness, congestion, and surface pigment. Little disruption to your week.
Medium depth peels reach the upper dermis. Expect five to seven days of noticeable peeling and redness, and plan around it. These address deeper pigmentation, scarring, and lines that superficial peels will not touch.
Deep peels belong in a medical setting with appropriate oversight. Not what most people mean when they book a peel.
Your practitioner should tell you which category you are getting and what the recovery looks like before you book, not after you have paid.
Why autumn
Professional peels work by controlled injury. You remove damaged surface cells and prompt renewal, and skin in that state is measurably more vulnerable to UV.
So treating pigment in July and then going back into strong sun tends to produce more pigment than you started with. This is the most common way I see melasma get worse, and it usually happens to someone who was trying hard to fix it.
Autumn and winter give skin recovery time before the next real exposure. Peel season is a real thing rather than a slow-period promotion.
The part that matters most on deeper skin
I want to be direct about this because the industry has historically been vague.
Deeper skin tones carry a meaningfully higher risk of post inflammatory hyperpigmentation, which means the treatment itself triggers new dark marks instead of clearing existing ones. It is not rare and it is not a small setback. Marks caused by an over aggressive peel can outlast the concern that brought you in.
That is not a reason to avoid peels. It is a reason to be specific about who performs them.
A practitioner experienced with Fitzpatrick IV to VI skin will usually reach for mandelic or lactic rather than glycolic, start at a lower strength than they think you can handle, build across sessions, and tell you at the consultation that this will take longer. If someone proposes an aggressive first peel on deep skin, that tells you how often they do this.
Ask how frequently they treat skin like yours. A specific answer is a good sign. A reassuring but vague one is not.
What you will be asked, and why
Before a peel you should be asked about isotretinoin use, now and in the past year. Retinoid and acid use at home and when you last used them. Recent sun exposure and any tanning. Cold sore history, because peels can trigger an outbreak and you may need antiviral cover. Recent procedures including injectables and waxing. Pregnancy. Previous reactions.
If nobody asks any of this, the treatment is a fixed protocol rather than a decision about your skin. That is the single clearest warning sign with this treatment, and it is worth walking out over.
You will usually be told to pause retinoids and exfoliating acids for several days to a week beforehand, and to avoid waxing in that window.
Afterwards
Expect tightness, some redness, and flaking that starts around day two or three.
Do not pick. I say this to every client and roughly a third of them pick anyway. Pulling at peeling skin before it releases is how you get scarring and marks from a treatment that was working.
Sun protection is not optional in the weeks after. Broad spectrum, SPF 30 minimum, reapplied. This is where results are kept or lost.
Pause actives until your practitioner says otherwise, usually a week or so. Keep it simple: gentle cleanser, moisturiser, sunscreen.
Call them if you get blistering, prolonged burning, spreading redness, or anything worsening across 48 hours rather than improving. Mild discomfort is expected. Escalating discomfort is not.
Who peels are not for
Anyone on isotretinoin, or within six to twelve months of finishing it, depending on your practitioner’s protocol and your doctor’s view.
Anyone with a currently compromised barrier. Fix that first. A peel on skin that already stings is adding injury to injury.
Anyone with active infection, open lesions, or a cold sore outbreak in the treatment area.
Anyone pregnant or breastfeeding should check with their doctor, since protocols vary.
Anyone with an important event in the next fortnight. Do not have your first peel before a wedding.
Common questions
How many chemical peels do I need?
Most visible results come from a course of four to six superficial peels spaced two to four weeks apart. A practitioner who books you as a series is describing how the treatment works rather than upselling you. Medium depth peels are performed less often and produce more change per session, with real downtime attached.
How much downtime does a chemical peel need?
Superficial peels usually involve mild flaking for two to three days, and many produce no visible peeling at all. Medium depth peels involve five to seven days of noticeable peeling and redness. Ask which category you are getting before you book, and plan the week around it.
Are chemical peels safe for deeper skin tones?
Yes, with the right practitioner and the right acid. Deeper tones carry a higher risk of post inflammatory hyperpigmentation, so experienced practitioners typically choose mandelic or lactic acid, start conservatively, and build across sessions. Ask how often they treat skin like yours before booking anything resurfacing.
What is the difference between a glycolic and a salicylic peel?
Glycolic is an alpha hydroxy acid that works across the skin surface, so it suits texture, dullness, and fine lines. Salicylic is a beta hydroxy acid and is oil soluble, so it gets inside the pore. If your concern is congestion, blackheads, and breakouts, salicylic is usually the better fit.
Can I get a peel before an event?
Not for the first time. Book your first peel at least four to six weeks before anything important, so you know how your skin responds and have time to recover from flaking or a reaction. Peels in the final week before an event should be gentle and familiar.
What should I not do after a chemical peel?
Do not pick at peeling skin, do not skip sunscreen, do not use retinoids or acids until cleared, and avoid heat, saunas, and heavy workouts for a day or two. Picking is the most common cause of marks from a treatment that was otherwise working well.
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