I was diagnosed with blepharitis. I also have seborrhoeic dermatitis (perhaps rosacea), which has significantly improved. Recently, I got very bad allergy symptoms. My eyes and nose became extremely itchy, causing me to sneeze a lot. This morning when I woke up, I had trouble opening one of my eyes due to a dark yellow eye discharge. Apart from being itchy, my eye was blood red and dry (only one eye). I had never had this much discharge before, especially after cleaning my eyelids to treat my blepharitis. It terrified me. Could this be bacterial conjunctivitis due to the color of the discharge and that only one eye was affected? What are other possible explanations?