I had Volbella a month ago. Started to get cold sores? (photo)

I am so sorry that you are experiencing cold sores on the mouth. This can happen after a lip augmentation with filler. Now that you know that you are at risk, you can pre-treat with Valtrex for 3 days prior to your next lip augmentation. This will help. For now, just stay on the meds until the sores clear up. 

If
you are prone to cold sores, any type of injection around your lips can trigger
an outbreak. Have your Doctor give you a RX for Valtrex (begin 3 days before
your injection) and that should hopefully minimize outbreaks going
forward. 

Thank you for sharing your question and photograph and I am sorry to hear of your viral breakout.  You did not mention if Volbella was injected into the area in your photograph that demonstrates the cold sores, but it would be unusual to have this develop a month after initial treatment.  I would continue with Valtrex for now and reassess the area with your treating physician to see if dissolution of the filler is in your best interest for clearance.  Best wishes.