I've had this pimple on my back and at first it was itchy, then it hurt after even when I put on my bra. So it was under my bra strap. But I rarely touched it, the only times I touched it was whenever i washed my back. So, after a few days I see that it's no longer a pimple anymore. It looks like a scab. I decided to pick it then it wasn't flat at all, but it was a hard ball looking. Then, when I looked back at my back it showed that it made a little hole looking in my back from where I picked it. After, I just covered that hole with a bandaid. Is it suppose to turn into some black ball if I don't touch it for a few days, even though usually it just goes away?