What happens to your skin when you use expired products? An expert weighs in

You do know your make-up, and skincare products expire, right? But let's be honest, how many of us actually adhere to those expiration dates? I'm pretty sure I'm still using a face mask I bought two years ago (please don't judge me). 

But that got me thinking - what actually happens to our skin when we use expired products? Obviously, those expiration dates are there for a reason, but is it unsafe to disregard them?

I asked Dr Alek Nikolic, a renowned specialist in aesthetic medicine and owner of SkinMiles, to weigh in.