Hydrocortisone cream/antihistamine tablets (if compatible with any concurrent meds) should help to bring it down. Can apply a cold compress (eg face flannel soaked in cold water) for brief intermittent applications. As such it doesn't look infected (increased redness around the puncture marks/noticeable increased level of swelling) as that would probably require treatment with Fusidic Acid and or Flucloxacillin. If it's infected then that may impact on your surgery date, but of course that wil be for the consultant to decide on.
Best thing to do is a wait and see progress as to whether those bites will recede over the next few days.