I had Juvederm injections about 1 1/2 years ago and I have blue lines at the injection sites. How long will they last?

Thank you for your question. It is difficult to determine how long the blue lines will last. Typically they can last 1 - 1.5 years, you can schedule a follow up with your injector to discuss a hyaluronidase injection to dissolve the left over product. Your other option is to wait until it dissolves on its own. Best, 

The unwanted, bluish-colored Tyndall Effect can result from too superficial a placement of a hyaluronic acid filler within the skin or injection within very fine, delicate skin, such as under the eyes. Since the duration of the effect of hyaluronic acid filler injections, with some exceptions like Voluma XC, seldom exceeds a year to a year and a half, one can reasonably expect the Tyndall effect not to persist longer than this. That having been said, I have personally treated a patient with the Tyndall effect who gave a history of having been treated in the smile lines over two years earlier with Perlane. A few microdroplets of hyaluronidase to dissolve the residual filler remedied that patient's problem within three days. 

If you can send in photos it may be easier to answer your question specifically.  It is unusual after injection of a hyaluronic gel such as Juvaderm to develop blue lines and to have them persist for 1 1/2 years.  It is best to have a knowedgeable physician evaluate your face and then make a recommendation.  This could be related to the injections or due to another cause.  Potential treatment options may vary depending on the diagnosis.  In all probability if these lines were due to a superficial injection they should have resolved by this time.