How Can I Get Rid of Cosmetic Injection Lumps from Six Years Ago?

Hi Say,
If it truly was hyaluronic acid that was injected, then it should be superficial in the skin. A small puncture with a #18 gauge needle and pressure should be able to squeeze the material out (I have seen this in a few patients after a year). Do not attempt this yourself, have a trained physician evaluate the situation. In Chicago, I might visit Steven Dayan, MD. Good luck and be well.
Dr. P

All good feedback from the panel members. As most suggested, it is highly unlikely that you were injected with a hyaluronic acid dermal filler. If you were, the product would not last this many years, it would have responded to hyaluronidase, and it would be a rare case wherein a body would respond with inflammatory nodules as yours has done with HA dermal fillers.
On a sidenote, one panel member mentioned that, to avoid potential adverse reactions from steroid injections, you must have a physician perform the treatment. It should be noted that there is always a potential for a negative or adverse side effect with intralesional steroid injections even with an experienced physician. Only you and an experienced practitioner can decide if the potential benefits outweight potential negative/adverse side effects.
Regardless of your decision, make certain you choose a practitioner that outlines all viable options with benefits vs. potential negative outcomes. You may also want to request (if you haven't done so already) a copy of your medical records from the physician that injected you. There should be a record of the exact product used, lot number, expiration date, etc.

Silicone injections can contribute to long term inflammatory reactions that can cause disfiguring nodules and lumps subcutaneously. The lumps and nodules should be treated accordingly with anti-inflammatory medications that reduce the inflammation and edema surrounding the foreign bodies. These can be applied subcutaneously, or topically depending upon the zone of inflammation.
Atrophy can be induced if the subcutaneous injection of corticosteroids are not performed by an experienced physician. A silicone protocol should be employed to minimize the risks associated with this procedure.

Six years ago, the only FDA approved products in the US were collagen based. These products were Zyderm, Zyplast, Cosmoderm, Cosmoplast and a now discontinued product called Dermalogen. While these could have caused lumps, it is extremely unlikely that they would cause such lumps like you are describing.
Sadly, you were probably injected with Silicone, which is NOT approved and has never been approved for facial injections. This is the reason to only have FDA-approved material injected into your face and, furthermore, to avoid anything that promotes itself as permanent or semi-permanent.
Ones to avoid now that are, indeed, FDA approved are Artefill and Sculptra. These can cause some very concerning problems. Others that are undecided/jury out are Radiesse and Evolence. While you can certainly have them done, they don't have the track record yet of Restylane, Perlane and Juvederm.
You need to get a second opinion from a dermatologist in your area with a good reputation.

Fortunately side effects from cosmetic fillers are quite rare. In my practice, I often get referred patients who do have complications, or had a suboptimal outcome.Lumps are generally the result of filler placed improperly, or too superficially in the tissues. These are noticeable right away and resolve either with injection of hyaluronidase to dissolve the filler, massage, or time. As your lumps appeared months after and are persistent years later, I think it is highly unlikely that the problem is hyaluronic acid. It sounds like you have a more rare complication where a granuloma forms. Essentially this is a form of a sensitivity of your body to the product. I would try kenalog mixed with 5 florouracil (5 FU) injections first. 5FU is very effective against scar tissue and does not risk dermal atrophy. If that failed, I would attempt micro excision combined with lasering of the scars to give optimal outcome. I wish you the best of luckDr S