hey, a couple of months ago I had a pimple on my back and I popped it and it's now what seems to be a bubble of skin on my shoulder filled with blood. I decided to try and pop it the other day and it just bled for ages and then filled straight back up with blood. it's now increased in size. I've covered it with two band aids but when I take them off it looks like puss on the band aid and around whatever this thing is. can I have some help please!