For the vast majority of patients, the expected lifespan for dermal fillers (Restylane, Perlane, Juvéderm, Radiesse, and others) may range from between 6 months to some time greater than 12 months. This would depend upon the individual patient, the product used, and the location the product is placed (both the anatomic location of the face, as well as the depth of product placement), and the quantity of material injected (if “full correction” is provided, or not). There are a small number of patients that do not experience this type of product duration. In my experience these patients tend to be thin patients who smoke, or who are very physically active; but there are others that fall outside these characteristics. Your altered immune function may certainly affect the longevity of the filler you have received. You would have to try out different products to see whether or not you would experience different results. Generally, all of the hyaluronic acid fillers would likely behave in a similar fashion. Radiesse may behave slightly differently because it is composed of a calcium phosphate microsphere. If you find that your fillers break down very quickly, and you are not seeing the results you desire, then consideration could be given to using autologous fat grafts, or a permanent filler such as Artefill. Sculptra may be another option for you, but that relies on collagen production, and I suspect that process may be altered for you as well. You should discuss your concerns with a board-certified plastic surgeon that has experience using all of these filler modalities, so that consideration can be given to using the treatment that would work best for you. Best wishes.