Firstly, congratulations on two months!
It seems like whichever option you choose your work will guess something is up. To be honest it would depend whether you would rather they speculate about the sleeves with no evidence (this may be easier to defend), or whether you would rather try and make excuses about the wound. Personally I would be inclined to wear sleeves and make excuses, i.e I don't feel great, am coming down with something etc etc, but it is up to you.
Whatever you decide, try to remember that at the end of the day it is none of your colleagues business! You have done exceedingly well to manage two months free and this does not have to mean the end of your recovery. Be proud of your progress. Try and say 'sod it' to whatever anyone else has to say. You are doing well.
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