When I was younger I remember a movie that had slug looking things in it and they would enter the body through the mouth and ears. All I can remember is a scene where the guy had fell down on a road and the slug looking thing flew into his mouth.

Only movie with slugs off the top of my head is the movie Slither. But that was like 3-4 years ago maybe

This reminds me vaguely of the puppet master. There were maybe 3 or more movies. In one of them, the puppets come to life by this injection a doctor had come up with. Then the puppets were basically good guys. They hurt him in the leg, and he fell over, then this other puppet started vomiting, I think leeches, and the crawled inside his mouth and hears and all over his body.

Yeah I do remember that as well. Sounds like that could be it. Not sure haven't seen that movie in forever!

Possibly,.

Night of the Creeps (86)

-view- (http://www.youtube.com/watch?v=hCDIc9zVkrs&feature=fvw)
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I totally saw the movie you're talking about when I was younger - I would have sworn it was called Night of the Slugs, but I think straydog is correct, I just looked up Night of the Creeps on IMDB - it sounds like a match...

Perhaps one of the series from X-files?

Heck, I am working my way through all nine seasons. I haven't seen anything like that yet, but I do remember an episode with something like that from when I was much younger. I'm only on season four right now though.

I was too little to remember all of what was in the episode. I only remember that 'slug' to go to the back of your neck, under your skin and it would sort of inflate. And I remember no more.

It is Night of the Creeps