Small Cluster of Tiny Bumps?

Hi,

So mainly on my thighs, mostly my right thigh and then on my arm, I have these tiny cluster of bumps. They don’t itch or hurt. And from far away, they look like bug bites. Anyone know what this is? 

I think it may be caused by guinea pig. It’s a theory. He has a cage and I often have to vacuum bedding, hay, and crap off the floor. Sometimes I have to sit down and clean out his cage. I always use rubbing alcohol too. But I’m wondering if it’s from him? 

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