Care & products
Sunscreen only protects as well as the amount you apply, and most people use far less than the label assumes. These articles explain how much you need for your skin type, why you can still tan through it, how to avoid a white cast on deeper skin, and what lightweight, stick and tinted formats really deliver. Every article that is mainly about sunscreen lives here.
Sunlight can fade some tattoo inks, so a tattoo is one more reason to wear sunscreen. No source shows you need a special tattoo sunscreen. A new tattoo is a healing wound and is a different case.
"Reef safe" is not a regulated term. Here is what Hawaii banned, what the 2022 National Academies review concluded, and how lab and reef concentrations compare.
Mineral sunscreens are said to reflect UV like a mirror. The optical data say they mostly absorb it. What differs is UVA breadth, stability, cast and regulation.
US "broad spectrum" is a pass/fail test at 370 nm, not a UVA number. SPF is mostly a UVB sunburn measure. PA, the EU ratio and UPF each measure something else.
A rash after a day outside is usually heat rash, polymorphic light eruption or sunburn. "Sun poisoning" is used for more than one of them, and a short list of signs needs care today.
Stinging is not the same as allergy. In patch-test clinics, 0.5% to 2.1% reacted to benzophenone filters, not most people, and mineral sunscreens carry fewer listed allergens on average but not none.
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Skinic