That sounds like it might be the original Darkman (1990)
A hideously scarred and mentally unstable scientist seeks revenge against the crooks who made him like that.
Peyton Westlake is a scientist ... When gangsters attack Peyton, he is horrifically burnt, and assumed dead. In his quest for revenge, Peyton, aka the Darkman, is able to take on the appearance of anyone (using the synthetic skin,) but he's only got 100 minutes per disguise.