Unless the twitching is painful or flat-out non-stop for a loong period of time I wouldn't worry too much.
I get that occasionally, too.
Sometimes it's my eyelid.
Little bastard just starts a twitchin' and a twitchin'.
Hardly visible in the mirror, and usually only lasts a few minutes to a half an hour. And it's very infrequent.
But damned annoying while it's happening.
Well, back to work on my veg station mods, and finishing up with sealing the closet up totally light tight again, but in a much nicer fashion than before.
Will have pics of my new Grow Closet 5000 mk-2.0™ over in the 600 later tonight or tomorrow morning.
Good to see your fresh journal, duchie.
You should have lots to post in the coming weeks & months!