I just had Juvederm on my lips with a cold sore present. I was on valtrex 24 hours prior. Is this bad?

Hello,I typically recommend against injection of the lips or use of lasers around the lips during an active infection.  It is a good thing that you started an antiviral prior to your treatment.  I would recommend continuing it for at least another week.  The concern with any type of manipulation of the lips is causing a cold sore lesion to present.  In your case, it was already present so the concern is possible spread to other parts of your lips.  The best thing to do at this point is to continue the valtrex.  Good luck.Payman Kosari, MDDermatology, Laser and Vein Specialists1918 Randolph Rd, Suite 550Charlotte, NC       

Generally we do not recommend lip injections be performed while there are active cold sores. It’s best to wait until the cold sores are resolved and take antiviral medications before and after to prevent a new outbreak. Now that you have been injected, though, the best thing to do is just to continue taking Valtrex and hope for the best. The main concern here is that the cold sore virus will spread and cause more sores to appear. In the future, I would recommend disclosing to your provider if you have any conditions such as cold sores so that your appointment can be rescheduled if necessary. Always be sure to see a board-certified dermatologist for any treatment.

It is best to wait until the cold sore is completely gone before proceeding with injections.  Best, Dr. Green