I am looking for a movie that came out in either the 80s or the 90s. I know this may sound weird, but bear with me!

I do not remember the plot of the movie, but the backdrop is in a desert of some sort and in a cave. The cave served as a type of laboratory for something. Well, one of the characters got hurt and the others injected him with a guinea pig virus to save his life. As a side effect, the person started to mutate. His hair falls out, and he cuts his ears off. His body goes through other mutation; I just cannot remember them. Then, he hides in the ventilation system and kills the other characters.

This has been racking my mind for about 3 weeks. Can someone, anyone please help?

Could it be "Hollow Man"? There is also one a little older called , "Manster", you can find it at Amazon. Hope this helps. Please rate my answer. Thanks