I can't get my earring back in?

Well, for Christmas I got an new pair of earrings to put in instead of the ones you get when you first have your ears pierced and I put them on and they were fine. My right ear hurt a little but not a lot. Then later I decided to take them out and put my old ones back in (I sterilized them before putting them in) but I couldn't get the left earring to go in! My mum said to leave it for the night and try again tomorrow. So I tried again today and it still wouldn't go in. I had difficulty finding the hole in my earlobe and when I finally found it, it was like I had to pierce it again but it hadn't closed up or anything. I got it in some of the way but now I can't get the thing to go all the way through. See, there's this kinda bubble thing at the back of my ear by the pierce (or on the pierce) and it wasn't there before I don't think. My mum said to just try and burst the bubble by putting the earring all the way through but I'm not sure. I really don't know what to do!