Why do I have these vertical pleats, folds, bands under my chin after having chin lipo, lower facelift, and neck lift?

From your history, there are a number of possible causes of this skin irregularity. The scarring, resulting from your Kybella and the loss of subdermal fat from your Morpheus 8 and your chin Lipo and the facelift have all created some scarring underneath the skin underneath your chin. These may be scar bands that you’re witnessing, unresolved loose skin or platysma bands, which have been uncovered from the chin liposuction. It is very difficult to know without a physical examination. I would return to your plastic surgeon and address these issues. Best wishes.

Thank you for your question.
This could be related to a delayed settling after necklift or possibly to intrinsic skin changes from your prior treatments. I would recommend you see a board certified plastic surgeon to see what can be done to improve the area. It's possible under local the incision under the chin can be reopened and the skin released and smoothed. Best to assess with an in person visit.
Best of luck to you!

Loss of elasticity and subcutaneous tissue support are some of the elements that contribute to this condition. In some cases injection of micro and nano fat grafts may improve this appearance. Good luck.