Is it safe to use corticosteroid (Kenalog injections) for lumps caused by Biopolymer?

I had biopolymer injected in my upper lip 12 years ago. It was a really small amount. Now I have some lumps (you can see it on the photo) and my doctor suggested using corticosteroids for those lumps. I wanna know: Can corticosteroids make a bigger problem? What is the worst thing that can happen if I use Kenalog injection for these lumps? They are soft, they don’t hurt, they only look bad.