Here's how the sticker could help prevent sun damage. Cosmetic company L'Oreal ... more cosmetically pleasing device, such as a clear patch. Kenet said even if these wearable devices become ...

UV detecting skin stickers are proving popular on social media, especially TikTok. The idea is that they turn from transparent to purple when your sun cream wears off, so you know it's time to reapply ...

After a minute or so, the spot should turn clear. This indicates ... the pool is covered in shade, the sun was shining with a vengeance this day, and the sticker let me know it.

"So far, there is limited research available on how these stickers affects sun protection habits, but three studies all seem to suggest that users are indeed more likely to reapply their sunscreen ...