'I don't think glass skin exists'. From pimple patches to 10 step skincare routines, from acne to redness; when is teenage skin 'problem' skin and how do you look after it? Social media is driving a growing interest in multi-step 'flawless' skincare routines with teens frequently searching for active ingredients like salicylic acid, retinol, and trends like 'glass skin'. But which skincare routines will do more harm than good, and are there any social media trends that teenagers should listen to? Tap the link in @BBCNews's bio to read more tips on how to care for teen skin. #Dermatology #BBCNews