Like all elective cosmetic procedures and treatments, there are side effects, and the same holds for PDO threads. When threads are poorly inserted, placed too superficially, or if the skin is too thin to support them, the skin can appear bunched. Since threads are static, they can also interfere with normal facial expressions. Other potential side effects include headaches, discomfort, infection, reactions, skin puckering, and, in rare cases, the thread poking out of the skin. Minor complications occur in 15 to 20 percent of procedures but are usually easily corrected. Still, PDO thread lifts have a much lower risk of complications than facelift surgeries, with less risk of scarring, severe bruising, and bleeding when performed by a trained professional.