WhySkin
The Journal
How to Find Your Skin's Undertone (And Why It Matters for Makeup)
Undertone is the single biggest factor in whether a foundation or concealer shade actually blends in. Here's how to identify it with a couple of simple tests, and how it maps to shade families.
How to Evaluate a Drugstore "Dupe" Before You Buy It
A "dupe" claim is only as good as the ingredient list behind it. Here's how to compare INCI lists to tell a genuine budget match from a marketing one.
The Complete Oily Skin Routine, Step by Step
A full AM and PM routine built for oily skin — gel cleansers, BHA treatment, oil-free moisturizer and SPF — and the mistakes that keep it from working.
How Much Sunscreen Do You Actually Need? The SPF Math Nobody Explains
Most people apply a fraction of the sunscreen labeled SPF ratings are tested with, and get a fraction of the protection as a result. Here's the actual amount.
Building a Routine for Fine Hair Without Weighing It Down
A full wash-to-style routine for fine hair: lightweight products, root-lift technique, dry shampoo as a styling tool, and the common mistakes that quietly add weight back in.
Where to Splurge and Where to Save in Your Skincare Routine
Not every product deserves the same share of your budget. Here's a simple rule for deciding which skincare steps are worth spending more on and which aren't.
Scalp Care for Every Hair Type
Wash frequency and scalp product needs differ by curl pattern and porosity — how to balance an oily scalp against dry lengths, especially on curlier hair types.
Cost-Per-Use: The Skincare Math That Actually Matters
A $60 serum and a $20 serum can cost exactly the same per day once you factor in how long each one actually lasts. Here's how to run the real math before you buy.
Curl Pattern Types Explained: 2A to 4C
A breakdown of the Type 1–4 curl pattern system and its A/B/C sub-patterns, how to identify your own pattern accurately, and why pairing it with porosity gives a fuller picture.
Building a Full Skincare Routine on a Budget
A complete four-step skincare routine can cost $460 a year or $222 a year for the same coverage. Here's the cost-per-use math behind both versions.
The At-Home Hair Porosity Test (And What Your Result Means)
How to run the float test for hair porosity at home, what a low, medium, or high result actually means, and how to adjust your product routine accordingly.
How to Identify Your Skin Type and Actually Build a Routine Around It
Oily, dry, combination, or sensitive — most people guess their skin type from a single bad-skin day. Here's a simple bare-face test you can run tonight, plus how to turn the result into an actual morning and evening routine.