Why do I feel like I'm lying on a bubble 7 years post op?

I'm female, slim, 60 yrs, 5ft 2.botched .Surgeon put huge breast implants in. Revision surgery 1 yr later. Implants placed intra muscular. I've always been aware of them sometimes when walking and always when lying on my side. But now the left side is like lying on a hard balloon. There is no change visually. I'm 120 lbs . Any idea why and will it subside over time. My right side feels fine.