My theory is a combination of dehydration, lack of washing, and no exfoliation, plus major acne scarring. His skin is dehydrated (lacking moisture, not to be confused with dry, which is lacking oil) but there's excess oil and he doesn't exfoliate, so it gives it that weird crusty look. The fact that he injects foreign hormones probably doesn't help, Men just have thicker and rougher skin than women, and he obviously had major acne which is causing the craterous texture. He also doesn't seem to do any upkeep, so he looks...like that.
Edit: Has he mentioned if he ever took Accutane?