Was eating my salad I made, and I noticed this on one of the pieces of the spinach. This is store bought raw spinach.. what does that look like? Dirt? I feel so grossed out right now.. I ate some already but don’t think it had anything on them.. will I be okay?

*edit

I always wash all my fruits and veggies but never washed salad that I buy in a grocery store. I asked a simple question. Don’t need criticism on whether I wash my other foods ..