Every few months, I get bites on my arm, usually a group of three. I haven't been able to find any evidence of bugs or shed skins, as evidenced by a previous post of mine a while ago, so I have no idea what it could be.
I then clean and vacuum my room and bed, put down some diatomaceous earth, and then the problem goes away for a few more months.
I got some bites again this morning, pictured here, http://imgur.com/qca2LaC .
What else could it be? There are no pets in the house, so fleas should be out. I just don't know what to do.