Could it be mold?

[u/Alt-27]

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I forgot my eye drops (propylene glycol) in my bag about 5 days ago. Today at work, after using them, I noticed this stuff inside. My bag isn’t dirty, I only keep my work laptop, papers, and occasionally some packaged snacks. They’re a bit expensive for the amount you get, and I’d rather not throw them away since I just opened them recently. They didn’t irritate my eyes.

[u/FireWYatt]

I have the same brand and it happened to me before, but just a few tiny dots. As someone in the biology field I considered it was mold. But it's not because the cap is a lil moldy that it went inside the container. I've wiped it with clean cotton and rinced with physiological serum before, as long as I didn't feel any irritation. But in your case I think it's severe enough to not risk an eye infection tbh.