Lumps are always worrisome because they can be due to a multitude of things, some which are serious, some which are not. All new lumps should be treated with suspicion. Lumps can start to develop due to significant capsular contracture in which case you require a capsulectomy, or even if a silicone implant has ruptured. If there was a rupture, and the parts of the implant broke off, it may feel like a lump and this may have to be diagnosed using an MRI. The breast lump like the one you're describing could also possibly be a ripple in the implant shell that is appearing now because your breast skin is thinning allowing the implant to be palpable. Alternatively, and less likely, it could be a benign or cancerous breast mass, and this is why every suspicious mass should be evaluated and properly biopsied. Without pictures, and in-person exam, no conclusive diagnosis can be made. Please visit a board-certified plastic surgeon, preferably your first surgeon who has your medical and family history, to have a breast evaluation, and if there is something suspicious, a mammogram may be needed. I urge you to not wait, and set up an in-person follow-up with your surgeon sooner than later. Take care