Mesotherapy is a technique that uses injections of vitamins, enzymes, hormones, and plant extracts to rejuvenate and tighten skin, as well as remove excess fat. The technique uses very fine needles to deliver a series of injections into the middle layer (mesoderm) of skin. The idea behind mesotherapy is that it corrects underlying issues like poor circulation and inflammation that cause skin damage.
The risks are minimal if you go to a trained practitioner.
Side effects that have been reported include: