apparently

[lenalatte]

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his whole hand is wrapped in bandages
apologies for bad quality

 

[Cassus]

So either it's sealed up, Sasuke damaged it, or it's in memory of Neji or something.(part 1 Neji had that on his arm/leg)

 

[SharinganisOP]

Maybe he had to use rasenshuriken with his barehands instead of throwing it. Could explain the bandaged arm... I guess.

 

[scorezor]

So either it's sealed up, Sasuke damaged it, or it's in memory of Neji or something.(part 1 Neji had that on his arm/leg)

or none of that

 

[A Perfect Orgasm]

It could be a synthetic arm in which he lost the original during this current fight or he hit sasuke with a rasengan and broke every bone in that arm, or just to cover up the seal :| either way, he looks badass

 

[Cassus]

It could be a synthetic arm in which he lost the original during this current fight or he hit sasuke with a rasengan and broke every bone in that arm, or just to cover up the seal :| either way, he looks badass

He has a Zetsu clone arm. It would really amp up the Obito parallel.

 

[Ryóma]

It could just be for style.

 

[Vapid]

That's what masturbation will do to you.

 

[Torche]

I've said it once, I'll say it again. His arm spontaneously combusted due to fapping in RSM, it was left terribly scarred and unhealable.