PPC and weight gain?

its been 2 months since my ppc injection around my jawline for my double chin. Over the 2 months, i have gained 15 pounds. I was planning on losing the extra pounds i have gained, but is now beginning to concern that my weight gain after the ppc injection will affect my overall results. If i were to lose the 15 pounds, will i still see my ppc injection results or will i have to end up getting the injection again since the fat may be restored? And yes, i am aware ppc is not fda approved.