Bea: Injectable fillers (hyaluronic acid, Juvaderm, Restylane) are generally safe and effective in well-trained, experienced hands. The FDA allows manufacturers to promote only specific uses; the nasolabial groove. However physicians are able to use the fillers in other areas (its called off-label use). Filling along the infraorbital rim, or the under-eye hollows is becoming an increasingly popular use. It can provide a more youthful appearance. It is anatomically more challenging than use in the nasolabial groove, and requires additional understanding of facial anatomy, particularly the eye itself and the structures nearby. "Cosmetic Injector / Laser Specialist" is a title given to a individual or "job description" by his / her employer. The terms do not have any significance related to licensure, accreditation, certification, training or experience. The person you describe is apparently a certified physician's assistant and depending on individual state laws may be legally able to perform the filler injections under a physician's supervision. My office has an experienced nurse practitioner performing some injections. Just like selecting a cosmetic plastic surgeon, you should ask about the doctor and PA's training and experience doing the procedure you plan. You may inquire about references, before & after photographs, etc. Be sure to discuss risks and complications and how they would be handled.