Need some help with my lowered TA!

Hey, so I've got an issue with my 99 TA. I lowered it probably 6 years ago and now one of my rear tires is wearing just like a front one would with the alignment off. You can almost visually see the tire leaning inwards at the top a little but why would it do this being a straight axle? It has an Eibach pro-kit on it and I've only noticed the issue within the last year (I have only put about 600 miles since the beginning of last year). Maybe a bad bearing or something? Any input is much appreciated

My guess is either a bad wheel bearing or a bent axle. Do you hear noise or feel vibration coming from the rear when you drive it? Any play in the wheel?

Something odd going on with it. Get it up in the air for a visual inspection. Have someone rotate the wheel as you watch it from behind. Look for any wobble or irregularity. Check the wheel for play by grabbing onto it and trying to rock it both back and forth and then up and down. Inspect your shock on that side for any damage or leakage. You can also remove it to check its compression and rebound.

I was leaning towards it possibly being a bad bearing since I don't have any vibrations or noise coming from it but now that I think about it, I think my shocks night be bad in the rear. When I had my new rims put on a couple summers ago, I noticed it was leaking. The car has about 138k miles on it so it's probably time to start checking/replacing things. Thanks for the input though!