Had chin lipo (laser) 4.5 months ago. Is this band in the center of my neck loose skin, scar tissue or platysmal muscle? (Photo)

Had Laser Lipo 4.5 months ago. Is this area in the center of my neck loose skin, scar tissue, or platysmal muscle? It appeared at about three weeks post-surgery. I lean away from it being platysmal because when I force my platysmal muscles to show, the area is between the muscles and doesn’t seem related to them. The area feels like a hard little band, and I have it at all times including at rest. It is not visible when I put my head back but I can still feel it with my fingers. Thank you.