Tight lines after PrecisionTx for my under chin. What can I do to fix this? (Photo)

Thanks for your question- looking at the images it is not clear if this is resulting from loose skin (which can occur if there has been liposuction of this area during the Precision Tx service, despite the tightening effect of the Precision Tx procedure overall) or if there is any tethering there meaning some scar tissue formed while you were healing from the procedure. In either case, the skin can be remodeled further. Consider doing a combination of Morpheus8 on the neck (3 sessions a month or more apart) + FaceTite (likely 1 session) to this region which will both tighten and smooth it. I would expect that combo to get you to your desired endpoint. I hope that helps.