BUG BITE!!!??? HELP!!!!!?

I have four bug bites on my legs. one looks different than the other and it is almost perfectly round, with a clear center (looked like a nipple). then the three other ones look like a small rash that had spread a little over the past week, with a little "nipple" on the top. i popper the perfectly rond one with tweezers, and one of the rashy ones. what do i do? will it infect it at all? how do i clean it??? PLEASE HELP!!! and if you know what kind of bug bit me that would be great to know.... Thanks :)