Rash and Blisters on Skin Above Upper Lip After Juvederm Injections?

Herpes eruptions can be triggered by lip injections. Any trauma to the area where cold sores (herpes) have occurred can potentially trigger an eruptions. One way to prevent these is to give antiviral medications, such as valcyclovir or famcyclovir, prior to lip injections.

It's also important to note that Neosporin can cause allergic reactions, so the burning may be from the herpes (which can last several days) or from an allergic reaction to Neosporin.  I recommend that you stop Neosporin.  If the burning continues longer than one week after the blisters have healed, please consult your injecting physician to determine the cause.

I believe your doctor is correct that this represents a herpetic eruption and the treatment is appropriate.  You should have no long term problems and it sounds like it is well on its way to healing.  Definitely should pretreat with an antiviral like Valtrex before any future fillers or other facial procedures..