After using erythromycin op for my pink eye it has gotten redder than before is this normal?

Not usually: You might becoming sensitive to the ointment, particularly if you've used it for longer than 2 weeks. Although redness is common with conjunctivitis, it usually resolves after 2-3 weeks. Most are viral. If your other symptoms of the pink eye are resolved (discharge, mattering, discomfort, eyelid redness) you're ok to discontinue the erythromycin ointment. Trial preservative free artificial tears.