Solid lump/bulge in delt

[GodEater617]

i have been pinning delts once a week for months, 1.5-2cc in each delt and I had stopped because what I think is scar tissue. It's like a ball of hard mass that comes out of medial delt head and when relaxed looks like muscle but when flexed kind of resembles synthol. Now I haven't pinned the delts but about a month later it's still here and looks about the same. I've been having it massaged deep tissue as well as foam rolling and the lacrosse ball massaging method.

What is this and how can I get rid of it? I'm stressing out over it because it fucks with my physique