When the hyaluronidase is injected into your lips, the dermal filler you already had, starts breaking down immediately. However, you will notice a considerable difference at least forty-eight hours after the injection. You also may see some swelling after the injection, but it is normal.
You should not be worried about it, as that means the dissolving filler is working. After forty-eight hours, you will see the results, and your lips will look reduced in no time. It depends on how your body and tissues react to the fillers.
That is why some people may notice immediate results, and some may notice results after a while. So, we always give a cushion of forty-eight hours for the results to become noticeable.