As you can see, there are numerous over the counter supplements that may lead to excessive bruising/bleeding with injection treatments. We also recommend that our patients avoid alcohol 24 hours prior (red wine seems to be a culprit especially) with the fish oil/omega supplements also being problematic.
Realistically, most patients forget to stop these daily regimens in time to make enough of an impact on potential bruising. Planning ahead will help if this is a significant concern for you. You may also ask your practitioner for a list of recommendations pre-treatment.
Because bruising is always a potential even with the best technique or avoidance of the above supplements, you may ask about a options to clear the bruise much quicker. For example, we use a pulsed dye laser to treat bruises which helps clear the bruise within 24-48 hours (generally) if done at the right time.
Web reference: http://www.celibre.com/restylaneTreatment.aspx