How soon after Juvederm injections do cold sores normally form?

I have never had any patient get sores after Juvederm, but have seen patients where a blood vessel has been damaged and this caused skin sores.  If you are talking about a herpes outbreak and are concerned, you can take valtrex prior to lip injections to prevent it from occurring.  Best, Dr. Emer.

Cold sores may form 1-2 days after filler injections around the mouth, and you may start to feel the onset a few hours after injections. To minimize the risk for cold sores, you may take Valtrex prophalactically as directed by your physician starting one day prior to the procedure.

Hello Klk93,Cold sores can develop within a few days up to a few weeks after injections around the lips.  The use of Valtrex can minimize the risk but not completely eliminate it.  If you do develop a cold sore when taking Valtrex then you should be switched to a different antiviral medication such as Zovirax.  I hope this helps and good luck.  

Cold sores typically do not form after Juvederm injections. But, in patients that have a history of cold sores, doctors often prescribe Valtrex, because it will lessen the likelyhood of developing a cold sore and shorten the duration of having the cold sore. I was at a cosmetic surgery conference this past year and raised the question, "what do doctors typically do for prophylaxis against cold sores" and there was no consistent answer - some doctors prescribe Valtrex before, some the day of and some for several days after. The bottom line though, is that if you start to feel a cold sore develop, and you use Valtrex as soon as possible, it should decrease the severity and longevity of the cold sore. 

Juvederm is a great injection and if you have a history of cold sores I would recommend you taking Valtrex prophylactically to prevent cold sores.