I'm thinking what Trenac is thinking -- I've never heard of shrimp with ick. Ick meds are more than likely to kill shrimp, so I wouldn't suggest them. If anything, I'd try salt if the 'spots' appear to be some sort of living creature. However, first I'd try to see if it is as Trenac suggests, a color variation.
Cherry shrimp often have many white dots/spots on their body. If the shrimp are a new addition, they were probably strassed at first and it took them a few days to get their color back. I am looking at mine right now and they have many spots, some have almost none and some have tons.
OK, upon closer examination they do look like white specs. I guess I was trippin. LOL . I don't like to loose my livestock, since it keeps me in good company, and brings a smile to my face . Thanks for the concern .