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How skin analysis actually works, what the data says about routines, and the decisions behind our privacy model.
Hand eczema is usually several things at once, which is why single-cause advice fails. Frequent washing is a risk factor, not a proven cause, and alcohol hand rub did not show the same link.
8 October 2026 · Skinic Team · 10 min read
Kojic acid has trial evidence as a leave-on cream used for months, not as a soap rinsed in a minute. Here is how it compares with hydroquinone, and whether safer is proven.
A sunscreen stick carries the same SPF as a lotion, tested at the same amount. In the one study that measured it, people applied a stick at less than a fifth of that amount.
SPF is tested at 2 mg/cm² and people apply far less. Lightweight describes how a sunscreen feels, and feel changes whether you apply it. Here is what the studies measured and what they did not.
The barrier layer is 10 to 30 micrometres thick and the dermis beneath it up to 4 millimetres. Here is what reaches each layer, and what the paper behind the 28-day renewal claim actually reports.
Dry and dehydrated are two different deficits sharing one word, and the fix for one can worsen the other. In a head-to-head trial, moisturiser raised skin hydration and extra water did not.
The thing that clears it is often the thing causing it. And in the largest recent cohort, 63% of people who got it had used no corticosteroid at all — which is not the story this condition is usually told with.
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