Weird thing on my chest?

I’ve had this thing on my chest ever since I had an open heart surgery when I was 3 months old but when I squeeze it, this “black” sort of like plaque would come out...? I’m guessing it’s bacteria but it’s almost gone but I was just never quite sure what it was in the first place (Photo included; also it’s red... show more I’ve had this thing on my chest ever since I had an open heart surgery when I was 3 months old but when I squeeze it, this “black” sort of like plaque would come out...? I’m guessing it’s bacteria but it’s almost gone but I was just never quite sure what it was in the first place
(Photo included; also it’s red because I was squeezing it out)
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