Cosmetic fillers are popular but come with risks. Here's what to know from a dermatologist.

More than 5 million people received filler injections last year, most often on their face or in their hands, an 8% increase from the previous year.

Despite their popularity, these procedures can carry some risks, experts say, leading to some being unhappy with their results and even having them removed. Some famous faces, including model Blac Chyna, have come forward to share their experience getting filler dissolved. 

So, what should consumers know?