Your first step should be to get evaluated by a plastic surgeon. If there is any question as to what the lumps are, further testing and evaluation should be performed to prove that the lumps are benign.
A saline implant deflation is very noticeable in the majority of patients with a deflated chest on the effected side. Lumps or rippling? It is not clear what you are concerned about.
You raise two important issues. As to the change in volume or shape of the breast 16 years post op, a slow leak and/or capsular contracture are the most likely culprits. See your plastic surgeon for evaluation. You may be sent for diagnostic testing to confirm and create a surgical plan.Any new lumps must be critically evaluated and diagnosed. Mammography, sonography and potentially needle biopsy may be required.Best wishes.
Any breast lumps warrant an exam by your surgeon. Especially if they are new or growing and changing. I'd recommend an exam by your surgeon or OBGYN. If a saline implant leaks the water is absorbed and it becomes pretty obvious as the implant deflates. The asymmetry in your photos could be caused by capsular contracture which could easily be diagnosed by an examination with a plastic surgeon. Best wishes!