Welcome in H.C.M.
I have gone through your query regarding swelling on face with feeling of buzzing on pressing as there is air in soft tissue
of face.All this happen after sinostomy for your chronic sinusitis
. Though unfortunately you faced allergic reaction
in your post operative recovery period, but your this problem is not at all concerned with allergic reactions.
You should investigate yourself by doing M.R.I. paranasal sinuses
to rule out any errosion or breech in outline of sinuses to give way to the air for reaching in soft tissue of cheek.