Hi, 

I'm a nineteen year old girl and for the past year I've noticed a sort of red flat lump on my upper chest, aka the manubrium as I believe it's called. Initially I just thought it was upper chest acne, but as other sores have cleared up this has remained for well over a year. I've never thought much of it because I've never had any other symptoms, but I think really I've just been scared. It's not exactly notable, it's slightly red and looks flat however it feels hardish to the touch. It hurts if I properly squeeze it, however nothing ever comes out- instead it just feels bigger when I do that though it does go down again. I can also move it, like if I pull my skin the lump will move with it. 

 I'm just so paranoid. Like I said I've had no other symptoms, I feel healthy etc. It's just  I've had the lump on my mind and I've gone down a rabbit hole on google and with it being red coloured I'm not getting much positive feedback. :/