Hello henry0505:Sculptra is a biostimulatory filler that requires multiple sessions for maximal and durable results. Your second session can be one month after the first. If a third session is needed it can be one to 3 months later. With each session, you see even more of a response to the same amount if Sculptra. Corrections lasts for at least 2 years. Radiesse is also biostimulatory, but, in addition, you achieve immediate correction as well. It is approved by the FDA for hand rejuvenation, as is Restylane Lyft.I have used all three fillers and each has certain advantages. Since you have already had one treatment with Sculptra I suggest you have another, and you should see even more correction per vial. Enjoy your summer! Dr. Clark