Guide
The complete guide to hormonal skin
The cycle, the zones, the four inputs, and how to read your own skin — everything in one place.
Read the guide →The Journal
Understanding your skin
Plain-language guides to hormonal skin, breakouts and the patterns behind them — no hype, no fear, just how to finally read your own skin.
Deep-dive guides
All guides →
How to trackHow to track your skinWhat a good skin and acne tracker should log, how to take progress photos, and how to read the pattern.Read the guide →
PatternsSame pimple, same spot, every periodWhy one spot keeps coming back in the same place, and what to log to see why.Read the guide →
Cycle & skinBreakouts after stopping birth controlWhat people notice when their natural cycle returns, and how to track the first few months.Read the guide →
Cycle & skinOily skin before your periodWhy your face gets greasier in the last week — and what to log.Read the guide →
Cycle & skinLuteal phase skinOil, congestion and sensitivity after ovulation, plus a gentle routine.Read the guide →
Cycle & skinWhy your skin looks better on your periodWhat your hormones are doing when your skin glows — and when it really peaks.Read the guide →
Cycle & skinBreakouts during ovulationWhy mid-cycle spots happen and why they often show up days later.Read the guide →
Cycle & skinBreaking out after your periodA late arrival from last week, or a new trigger? How to tell.Read the guide →
Products & ingredientsIs my skincare breaking me out?Reaction, purging or cycle timing — a one-change-at-a-time method.Read the guide →
Skin log methodHow to find out what’s causing your breakoutsA simple 4-week skin log and how to read the pattern.Read the guide →
Free toolWhich phase is your skin in today?Enter your last period date and see your cycle as a ring, day by day.Open the calculator →
Articles
Patterns
Why do I break out on my chin and jawline?
The most hormonally reactive zone on your face — and what it's telling you.
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Understanding
Hormonal breakouts vs regular breakouts
How to tell the difference by timing, place and pattern.
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Habits
A skincare rhythm for every phase of your cycle
What your skin needs across the month — without overhauling everything.
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Patterns
What happens to your skin during your period
The premenstrual flare, the period itself, and the days after.
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Habits
How stress and cortisol affect your skin
Why hard weeks show up on your face — and what helps.
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Understanding
Estrogen, progesterone and your skin, explained
The two hormones behind your monthly skin rhythm.
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Habits
How long does it take to see skin improvement?
Why one month isn't enough — and how to measure real progress.
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Patterns
Why your breakouts follow your cycle
The same week, the same spots. What that rhythm is telling you — and how to read it.
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Patterns
Why do I break out before my period?
Same week, same spots, every month. What that premenstrual flare is telling you.
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Understanding
How to tell if your breakouts are hormonal
The everyday signs your skin follows your cycle — and how to find out for sure.
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Inside Aperia
How Aperia reads your skin
What a zone-by-zone skin score actually measures, and why it changes day to day.
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Habits
Stop guessing: what actually drives your skin
Sleep, stress, food, cycle. Four inputs, tracked in seconds, that explain most of it.
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Habits
Do dairy, sugar and stress cause breakouts?
It depends on you. How to find your own triggers instead of guessing from a list.
Read →Deep-dive guides: your cycle, products & breakouts → · Cycle skin calculator →