Dermatologists warn to get any benefit and reduce wrinkles the mask would need to be used regularly for 10 to 15 minutes a day Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice LED technology has been used by dermatologists for decades to treat an array of skin issues