Trying to remember a sci-fi show...

Sounds like Gene Roddenberry's Earth: Final Conflict

Do you remember anything else about the show?

There was an episode of Stargate featuring white skinned bald aliens, and one of the main characters has a symbiote/parasite worm thing (though not in his arm).

Yup, it was E:FC.

Which went precipitously downhill at the start of each and every new season, until i finally gave up watching....

LOG said:

That's the one
The thingy I'm thinking about on him arm was probably his CVI.

Click to expand...

Nope, the CVI was a virus thingy implanted in his brain to make him, well, brainier. The thing on his arms was called a Scrill (sp?) and was a weapon. I actually liked the show. Well, the first season of it. I only sporadically watched the other seasons and probably didn't watch any episodes of the last one. It was Majel Barret (Gene Roddenberry's wife) who got the series off the ground after her husband died and was an exec producer. From what I heard there was a lot of in-fighting between crew and bosses over pay, which contributed to the high turnover of main characters.