Random bug bites/hives??

I often get these huge bug bite like things that get really big and start oozing clear liquid and turning dark after a day or two, but they end up going away after a week. This is the most I’ve had! They’re super itchy, and my boyfriend who sleeps with me every night never gets them. They happen randomly and not necessarily in bed. I never see the bugs. What could this be?? Please help!