Continuing with Kybella more than a year later?

There is no medical reason why you cannot have a third Kybella treatment more than a year after your first two treatments. Each of those treatments probably removed about 25% of your submental fat, which means there is still more to be dissolved. The only reason we suggest having the treatments closer together is so that you get your final results sooner.
As for the dimpling, I'm not sure whether that's from fat or collagen. Consulting a board-certified dermatologist will give you a better idea of what's causing the dimpling and whether it can be remedied simply by your third Kybella treatment, or if you need some other treatment to remedy it. 

Thank you for your question about an extended time-frame for Kybella treatments.  In our office we typically space our sessions 8-10 weeks (or more depending on our client's schedules) apart, and most people will need 2 to 4 sessions for a full treatment.  There shouldn't be any harm in having your 3rd treatment more than a year later, and the irregularities you see in your skin may improve.  If not, there are other treatments that can help with a smoother appearance. Your board certified provider should guide you through this process.  Best of luck with your treatments!

If there is residual fat after Kybella, despite a longer time frame than 5-6 weeks after the last treatment, more can still be done. The result may not be as consistent because of some mature collagen production that had developed over the year as a result of processing the dead fat cells. If there is a dimple a year after treatment, it is doubtful it would correct itself so patients who have any issues they are concerned about after a cosmetic treatment should see the doctor who treated them for a follow up examination.