PMMA is a permanent filler that remains in the body indefinitely. In cases of autoimmune conditions, there can be concerns about how the body might react to a permanent implant. The body's immune response could potentially be triggered or exacerbated by
PMMA, leading to complications.
Ellansé, on the other hand, is a non-permanent filler that stimulates collagen production and gradually dissolves over time. The advantage in your case could be that if there is an adverse reaction, the effects of Ellansé are not permanent. While Ellansé also stimulates collagen, the substance itself dissipates over a period, usually a few years. This could potentially make it a safer option if there's a concern about how your immune system might react.
HA's would of course be the safest.
Regarding the use of steroids like prednisone, it's true that prolonged or high doses can suppress collagen formation. However, the intermittent use of steroids to manage flare-ups may not significantly impact the effectiveness of collagen-stimulating fillers. The main concern with fillers in the context of an autoimmune condition and steroid use is more about how the immune system reacts to the filler material rather than the impact on collagen production.