I had an acne spot under my chin that took a while to go down, it was under he skin so I couldn't pop it....anyway it eventually subsided but now I'm left with a tiny lump under the skin where the spot used to be...it's difficult to feel most of the time, I have to stretch my neck to feel it and it not visible on the surface at all. I am concerned about it now as its not gone and is still there 8 months or so on from the acne...what could this be? I suffer from health anxiety which doesn't help at all.