What Causes Itchy Bumps All Over The Body?

Over the past two weeks I've had itchy bumps spreading slowly over my body, usually in groups. There is no puncture wound or head to the dime-sized bumps, just red and irritated with pale yellow like a bruise. Many others in Philadelphia are reporting the same thing, and I've seen people with similar bumps. No one can tell what it is. First I tried Calamine, nothing. Then hydrocotisone, nothing. Now I'm just freaking out. It's not getting better. Started on my ankle, now on every area of my body. First bump on my forehead today. I thought about chiggers or bedbugs, even been sleeping on my floor. But I don't think that's it. There's no evidence after thorough searching. I've been showering religiously with antibacterial soaps and Aveeno colloidal oatmeal scrubs. I'm stumped. And paranoid. My performance at work and college is being affected by my frustration. I fear it's gonna keep spreading.