4 months post op Voluma in cheeks, now having pain. Do I need to be worried?

Thank you for sharing your question and I am sorry to hear of your soreness. I would recommend reaching out to your injector for an in-person evaluation.  Without photographs it is difficult to offer definite advice but it is important to rule out a delayed infection. Hope this helps.

This needs an in-person evaluation. I suggest following up with your injector or cosmetic dermatologist. The filler may need to be dissolved. Best, Dr. Emer

This is best answered with an in-person evaluation. I suggest following up with your injector. If necessary, the filler can be reversed with hyaluronidase. Hope this helps.

While it is unusual to have pain this far out from the filler, I have seen delayed reactions to the filler such as delayed onset allergy and or infection. Sometimes it's hard to differentiate the two. If there is an allergic, infectious, or some other response to the filler you will typically have swelling, redness and/or itching in addition to the pain.  I suggest seeing you injector to get a thorough exam. If it is the filler it can be dissolved with hyaluronidase, although volume is more difficult than some other hyaluronic acid fillers to dissolve due to its cross linking and way it is made.