Can I Get Hyaluronidase 1 1/2 Years After a Restylane Treatment?

You could return to your injector for assessment to see if hyaluronidase would help dissolve the Restylane.  It is worth a try if you do not like your lips.  You could also discuss adding more filler with an experienced injector to even out your lips.

Hyaluronidase can certainly be injected at any point into the skin, but realistically speaking, the filler is typically gone by 6 months in the lip area so the benefits here would be modest at best.