The literature on cjcDAC shows site swelling as a common side effect of the peptide. I inject all subQ injects off the side of my hip a couple inches below my waistline so it's in an area that no one notices.
Are you using cjcDAC that was reconstituted back in January? If so, I would think it has gone bad. CjcDAC is a long chain amino acid so it's not going to remain stable for too long.
I have knots in my glutes from various AAS and other fat burning injects that have been there for months. Some take a long time to go away.
You could have a doctor check it out. He can tell you if it's swollen tissue or a sterile abcyst.
I hate going to doctors. I had an infection in my right bicep from injecting mct oil. I had to drain it of blood and puss 5 times so that it has finally about gone away. It took 3 1/2 months to heal. Each time I drained it, it improved.
My guess is yours is swollen tissue that got severely irritated. I had that in my abdomen from myostatin hmp. It hurt like hell for a month. It eventually went away.