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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like the discharge is what caused the redness to the lower eyelid. That's not too uncommon with there is gunk that gets caked to the hair below the eyes.
The question now is whether this is an allergic conjunctivitis or an ulcer to the cornea. If it's an ulcer, then we would ideally use a broad spectrum antibiotic drop like Neo-Poly-Gram. If it's conjunctivitis, this is usually allergic in dogs and we treat with a steroid drop.
The eyelid irritation will resolve once the discharge resolves.
I hope this helps, let me know if you have any other questions.