Hi and thank you for your question! We only recommend hyaluronic acid fillers for the lips as they tend not to cause lumps and any undesirable results can easily be corrected with enzyme injection. Lumps persisting 8 years after lip injection can be unrelated to filler, or indicative of non-hyaluronic acid fillers. An example is Radiesse that is not recommend for lips, as it can lead to lumps. Although I am not sure if even Radiesse can last this long, an x-ray can show if it is present in lips. Please consult an experienced cosmetic doctor for an accurate assessment and possible referral for further investigation. I hope it helps and good luck!
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