I don't even want to hear it.
I bobbled all off-season about whether to keep Harden or Beckett. Projection-wise, I found them to be virtually the same, so I kept Harden, if only because of Beckett's blister history.
Then this happens.
Nonetheless, this is nothing serious. The problem with Beckett was that the blisters recurred. The next time Harden develops a blister, then you can get worried.