At the Consumer Electronics Show in Las Vegas this week, skincare brand L’Oreal debuted its My UV Patch, a stretchable skin sensor designed to monitor UV exposure and help consumers educate themselves about sun protection. The patch will be introduced by L’Oreal’s dermatological skincare brand, La Roche-Posay, and is a transparent adhesive that stretches and sticks directly to any area of skin that consumers want to monitor. It is expected to be made available to consumers later this year.  Measuring approximately one square inch (6.25sq cm) in area and 50 micrometers thick – half the thickness of an average strand of hair – the patch contains photosensitive dyes that factor in the baseline skin tone and change colours when exposed to UV rays to indicate varying levels of sun exposure.  Consumers must take a photo of the patch and upload it to the La Roche-Posay My UV Patch mobile app, which analyses the varying photosensitive dye squares to determine the amount of UV exposure the wearer has received.  See more at spaopportunities.com.