I was cleaning the Michelins tonight on my 2009 XLT 4x2 SCrew. During the scrubbing of the white letters, my hands were rubbing the tires in that area and found some slight "bumps" or "waves" in the sidewall. They are not large by any means. It just felt weird not to feel a "smooth" sidewall as I was scrubbing the letters. Anyone else have this issue on the same tires, or on any tire in general? Am I worrying about nothing?

These have been great tires otherwise, and am a bit bummed to find this issue, if in fact it is a true issue.

TIA!