Are both Wheels to the right when the steering wheel is at 0 Deg? If so, and they are by the same amout is not likely that it has been caused by a bump. Also if they were it would probably not cause uneven wear. You would just steer to the left to compensate. Your steering column would need adjusting. It really sounds like your wheel geometry is out (tracking). This can and does occur with a bump. But its more likely hitting a kerb than a speed bump would cause this.
Anyway, Take it to ATS euromaster or similar asap. Checking/adjusting the geomerty would cost less than half as much as one new tyre. You are runing Both front ones by leaving it. It's also reducing your grip on the road. (yes even with Traction Control).
A lot of dealers no longer check geometry themselves. It's just not worth the investment in the equipment/staff/space. It works out more cost effective to use a 3rd party to do these checks. The dealers just can't compete with those tyre places you see every where...
