USB Stick Won't Appear on Desktop or Disk Utilities

Hi there,
One of my USB sticks doesn't seem to appear on my iMac. I have looked in disk utility and it doesn't appear there so I can't format it, and I have plugged it into another Mac and have had the same issue.
My external hard drive still appears and continues to back up using time machine, and I have tried the other USB ports in case one was faulty.
Has anyone come across this? Any tips?
Thanks a lot.

I have plugged it into another Mac and have had the same issue.
It is possible the stick has failed since you are having problems on 2 computers and not getting the correct response from what arthur suggested.

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