How Do You Correct Too Much Fat Removed During Neck Lift

your photographs appear consistent with liposuction that was done only a few weeks ago, possibly slightly longer, but much improvement might be obtained in the next several months.  External ultrasound and massage may help soften and smoothen the tissue. It is impossible to diagnose over resected fat without an examination in person. Continue to followup with your surgeon and ask what treatments can be offered to expedite the resolution of what might be a temporary situation.
 

This can happen when you over aggressively defat the neck in hopes of lifting the neck.  As you can see the muscle is contributing to the neck being lax.  A neck lift will tighten the area and allow the skin to contour the new shape underneath. You may still need fat grafting in the neck at a later point in time. But this can be improved.

Thanks for reading, Dr Young

From your photos it looks like you have fibrosis of the tissue which has gathered together in bands.  It does NOT look like excessive resection.

This is fairly common after submental liposuction, especially where laser or ultrasound energy is used.  It can be prominent if compression or head position was not maintained properly.

Usually massage and time will help improve this.  Talk with your plastic surgeon to get instructions regarding proper massage techniques.