Does it still hurt? If there is pain you probably should see a clinician.

If it’s generally ok, have you tried rolling it out with a lacrosse ball? Put it on the sore spot, lay back on it gently, then move the arm around and overhead. Go upstream and downstream from there. Also go all around the scapula.

Note that I have a rib that likes to pop out, which fires up one thread of some muscle under my left scapula. Whenever I get it or back in, it feels a ton better. But it has a habit of popping out a lot now which sucks.