Post partum developed ecoli in blood and had kidney abscess 4 months later had scan after pain on same side showed 8mm cyst could this cause the pain?

Here are some...: According to what you reported, you deserve a congratulation for recovering from upper urinary tract infection with kidney abscess. As to finding a 8-mm cyst in kidney, it most likely represents an incidental finding with no clinical significance, namely, not causing symptoms. For more individual specific details, ask your treating doctor timely.