The short answer to your question is that in experienced hands, fillers are used routinely to better define the vermilion border of lips (the line dividing the red lip and white lip), an approach that helps not only to define the lips, but provide some desirable lip pout, and smooth "bar code" (aka "smoker's" or "lipstick bleeding" lines. Bruising tends to be minimal and coverable with makeup. Belotero Balance is my preferred filler for this purpose as it possesses little to no tendency to give rise to the unwanted bluish/gray Tyndall Effect when injected superifically, as needs to be done in this case. Make sure that you consult with a board certified aesthetic physician with experience and expertise with advanced uses and injection techniques for fillers. Be cautious when evaluating non-core physician, non-physician injectors, and medspas. Regarding the latter, in a recent survey conducted among the American Society for Dermatologic Surgery members, it was found that "the most common treatments associated with complications included fillers..." This survey further concluded that "With the rising popularity of medical spas and possibly their increase scope of practice, stricter rules and regulations are necessary to protect aesthetic patients from harm." So, good luck and do your due diligence before agreeing to proceed.
