Your injector will ask about your medical history to determine if you are an appropriate candidate for treatment. The product should not be used in patients who have severe allergies marked by a history of anaphylaxis, a history or presence of multiple severe allergies, allergies to lidocaine, and/or a history of gram-positive bacterial proteins. If you have a history of cold sores or herpes, you should be treated with an anti-viral by your primary care doctor before and after being injected, as injections could cause flare-ups. Unfortunately, you cannot get filler injections while pregnant or breastfeeding.