Bruising following Restylane injections to the lips are very common, and often don't become evident until this next day. The lips are highly vascular, and the inadvertant injury to a small vessel is the norm rather than the exception. To minimize the risk of excessive bruising I suggest you ice your lips both before and after the procedure.
I do not feel that Arnica is beneficial in this scenario, and am not aware of any studies demonstrating its efficacy. Benedryl probably would not be helpful, because this is unlikely to be an allergic type reaction.
Time will usually resolve the bruising issue. If excessive fullness is noted once the bruising has resolved, then Hyaluronidase can be injected into the lip, which will remove the Restylane.





