Is your skin barrier stressed?
A serum that suddenly stings, tightness after cleansing, makeup that will not sit: ten signs, one point each, one status. You get the status, a ring out of 10, a 14-day plan that cuts the routine back to three products, and a card you can save.
Tick the signs you notice right now.
Each sign counts one point. The status, the ring and the 14-day plan update while you tick, and nothing you enter leaves this page.
The ten signs
Calm
0 of 10 signs tickednothing to repair
Nothing ticked so far. Tick every sign you recognise: the status, the ring and the plan update as you go.
- 0 to 2Calm
- 3 to 5Stressed
- 6 to 10Compromised
Your 14-day plan
You do not need a repair plan today. This is the plan to run if two or three of the signs turn up later.
Days 1 to 14 · keep
- A gentle cleanser, once a day in the evening, lukewarm water only
- A moisturiser with ceramides or glycerin, morning and night, on slightly damp skin
- Sunscreen every morning, 2 mg per square centimetre, about a third of a teaspoon for the face
Days 1 to 14 · pause
- Acids: glycolic, lactic, mandelic and salicylic
- Retinoids at every strength, prescription or over-the-counter
- Scrubs, cleansing brushes, cloths and hot water
- Vitamin C serums, and anything with fragrance or menthol
From day 15, bring back one active on two nights a week, then wait 14 days before you add the next one. If a sign returns, drop back to the three products for another week.
Recheck in 14 days.
See a doctor when redness lasts beyond 2 weeks, when the skin weeps or crusts, when a patch spreads or hurts, or when eczema, rosacea or an allergy is already known. This check counts signs, it does not diagnose any of them.
How it works.
- Tick every sign you notice, from a serum that suddenly stings to makeup that pills. Each sign counts one point out of ten.
- Read the status, the ring and what the score means, then press Check to keep the status and the date in this browser.
- Run the 14-day plan: three products, no actives, and one active back on two nights a week from day 15.
What the barrier actually is
The barrier is the stratum corneum, the outer 10 to 20 micrometres of your skin: roughly 15 to 20 layers of flattened corneocytes set in a lipid matrix of ceramides, cholesterol and free fatty acids in a molar ratio of about 3:1:1. That mortar decides how much water leaves you. Dermatology measures the loss as transepidermal water loss, TEWL, in grams per square metre per hour, and a damaged surface can lose several times as much as an intact one. When the ratio is disturbed, water goes faster than it is replaced, the surface stiffens, and whatever you apply reaches the nerve endings sooner. That is why a serum you used happily for months can start to sting: the formula has not changed, the wall has. The barrier guide goes through the signs one at a time.
Why it breaks, and what repair costs
Two habits explain most cases: exfoliating 3 or more times a week, and stacking two or more actives every night. Hot water, harsh surfactants, indoor air below 40 percent humidity and cold wind push in the same direction. Repair is mostly waiting, because the outer layer renews in about 14 days and a full turnover takes roughly 28 days in young adults, longer after 50. Ceramides and glycerin refill the mortar, petrolatum lowers water loss by more than 95 percent in laboratory tests, and niacinamide at 2 to 5 percent raises the ceramide production of the skin itself over about 4 weeks. None of this is quick, which is the whole reason the plan holds for 14 days before any acid comes back. The exfoliation guide sets a sensible frequency per skin type and per acid.
What this tool is not
It counts the signs you report and nothing else. It does not look at your skin, it does not measure TEWL, and it cannot separate a stressed barrier from eczema, rosacea, perioral dermatitis, an allergy or an infection, which can look similar from the outside and need a doctor. Book one when redness lasts beyond 2 weeks, when skin weeps or crusts, when a patch spreads or hurts, or when you already have a diagnosis. Small bumps that appear after a new retinoid may be purging rather than damage: the purging guide gives that up to six weeks and explains how the two differ.
Frequently asked.
How is a stressed barrier different from dry skin?
Dry skin lacks lipids all the time and behaves much the same from week to week. A stressed barrier is a change: products that were fine begin to sting, the skin feels tight after cleansing, and it reacts to things it used to tolerate.
How long before it feels better?
Most people notice less stinging and less tightness within 5 to 7 days on three products, and the outer layer renews in about 14 days. Damage built up over months of over-exfoliation can take 4 to 6 weeks to settle.
Can I keep my sunscreen while the barrier repairs?
Yes, keep it. Sunscreen is one of the three products in the plan, and if a chemical filter stings, switch to a mineral filter with zinc oxide or titanium dioxide until the stinging stops.
Is this eczema or rosacea?
This check cannot tell, and it does not try. It counts signs that overlap with several conditions, so redness that persists beyond 2 weeks, weeping, crusting, pain or a spreading patch belongs with a doctor rather than with a new moisturiser.
When can I use a retinoid again?
From day 15, and then on two nights a week only, with 14 days before you add anything else. If the stinging or the flaking comes back, return to the three products for another week.
What does the tool store?
Only the last status and the date you took it, in the local storage of this browser under one key, and only when you press the Check button. Clearing your site data removes it, and nothing is sent anywhere.
Guides behind this tool
Skincare
A damaged skin barrier: signs, causes and repair
Skincare
How often to exfoliate: by skin type and acid
Skincare
Skin purging or a breakout: how to tell them apartMore tools
The Barrier Check counts ten signs that you report, nothing more. It does not examine your skin and cannot diagnose eczema, rosacea, an allergy or an infection, so persistent redness, weeping or crusting belongs with a doctor. This page is for general information and does not replace advice from a dermatologist, physician or qualified practitioner.