BBL after HA fillers not dissolved

Hello, I had hylauron filler in my buttocks and had it dissolved . I had 5-6 treatments with hylase. Since there is a large amount, (100cc, )there is still a little Bit in the buttocks.mainly everything relatively high up and NOT spread over a large area. I have an appointment with a board-certified doctor who has been tried and tested with such treatments. He would inject using ultrasound and Not inject the hylauronic acid areas with the vibrating cannulas, but by hand. He had many patients.