In order to get Miles Dyson to fully comprehend the 'Sarah just tried to murder you' situation and the reasons for doing so, John hands the Terminator a switchblade and instructs him to "Show 'em". The Terminator proceeds to cut off the skin/tissue coating of its arm & hand in order to reveal the endoskeleton underneath.
Now it would make sense from a longevity point-of-view to try and maintain the skin cover for as long as possible.* We know The Terminator's long-game plan was to skip town with John and avoid further confrontation with the T-1000: numerous times it warns John (and later, Sarah) that the actions they planned to take would be anticipated by the T-1000.
I seem to recall after revealing its hand, the Terminator was wearing gloves after this scene, but we also know that Terminator tissue heals quickly:
John: You're healing quickly.
Cameron: Faster than you.
- (Terminator: Sarah Connor Chronicles).
Is there any evidence that the Terminator replaced the skin after the reveal?
* They certainly didn't know at the time that the Terminator would be dead that night anyway.