Hi there Dave.
This sounds like a condition called acute urticaria
Yes it may very well be caused by an insect bite reaction or due to a variety of other reasons.
Is there any fever
, joint pain or any difficulty in breathing?
It may be better for you to go across to a deramtologist or to the ER to get a prescription for an antihistamine that works around the clock & also perhaps to be started on a short acting tapering dose of steroids
should subside in a couple of days & then once the acute phase is passed, you can try to isolate what the allergen was at a later date 2 weeks after stoppage of the steroids et al .
Cheers & wish you a clear skin soon.
Dr Praveen Rodrigues MD