bugs on my romaine lettuce

[jodilain]

Hello everyone, I have 4 gourmet romaine lettuce plants in my garden. There are these little tiny bugs in the underside of the leaves. All my other vegetables don't have these bugs (tomatoes, broccoli, basil, pole beans) someone at the store told me they might be avids? How do I get rid of these. I put a product called Neem on it and nothing really happened. I'm trying to stay away from harsh chemicals but these things are bugging me lol. Does anyone have any clue, I could maybe get a pic later today if possible..thanks everyone for your time reading and your thoughts. I'm a newbie here, first year really going full force for a garden