Injectables are big business: Over two million people received botulinum toxin or filler injections in 2017, according to the American Society for Aesthetic Plastic Surgery. The popularity of temporary HA fillers, specifically, has soared 85 percent since 2012. And practitioners of all kinds — with varying degrees of training and experience — are capitalizing on the demand.

Fillers are generally very safe when injected by board-certified dermatologists and plastic surgeons armed with an intimate knowledge of human anatomy and “filler crash carts” stocked for potential complications. But this is merely rule number one of getting filler. Read on for everything experts want you to know before submitting to the syringe.