Pretty sure I had scar tissue from not massaging it. Make sure you massage it. I only did it in the peak of the bi. About a year later I could still feel it there. I started another seo awhile back and did them all over(for more mass) and I massaged it and that one spot seems to be getting way better.
I did a bunch of reading on scar tissue and sounds like the only thing that helps to get rid of it is massaging it.