When administered by a properly trained injector there are minimal side effects. In some cases there can be some minor swelling and/or bruising. If facial fillers are not injected properly, it can cause pain, and it can result in an odd-looking appearance. It’s extremely important to research the injector before you trust your face or lips to them. Look for a nurse practitioner or physicians assistant with extensive training and experience, not someone just starting out. Make sure they are using only top of the line injection products like Restylane, Juvederm and Versa.