If someone actively says that tattoos are a dealbreaker, then yes, you should tell them you have tattoos, so you're not wasting either your time or theirs anymore.
If it's just a turnoff, I'd say also tell them, though it may well turn out not to be a big deal in that case--a lot of times, we're "turned off" by an attribute in general but can get past it if we're really into the other person. Just like, for example, I am way into tall men but once fell stupid gaga lose-my-mind in love with a guy who's 5'2". I still notice the tall ones more when I'm walking down the street, but this particular short guy was hot as hades to me. In the same way, if your SO dislikes tattoos in general, he might still find yours cute individually, or he might just realize he doesn't really care one way or the other. Or it might be a dealbreaker. You never know.
No, you do not need to put them in your dating profile. I can only imagine the awkward photos that would result if everyone had to get all their ink into their profile pictures. "Here's a picture of my left calf!"