If its just the one tire it COULD be a very slightly bent rim. I have run into that before. Easy way to rule it out is to move the rim, if a tire wears funny in the new position trash the rim and get a new one.
Otherwise id still start with an alignment after moving the rim. It rules out like 95% of common issues. For example if you curbchecked that wheel it may have slightly knocked it out of alignment or something. Its a cheapish way to rule out most issues. If it goes away great problem solved. If not then we start getting to expensive ####.
For example that pattern looks like when i had a shot wheel bearing, easy way to check is spin it while its jacked up for an alignment and moving that rim and see if it makes noises. Wont always make noise if its shot, but if it does there is likely a good chance it IS a bearing issue. That said though it could also be a slightly bent spindle if you whacked something just so.
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