2 nights ago, I suddenly felt something irritating my left eye and looked in the mirror and saw that there was a bubble, something like a cyst, on my sclera. I took ibuprofen and a few hours later, the bubble disappeared but my eyes were still very red. I then went out to buy eye drops and a few minutes later, my eye returned to normal. However, I had to keep reapplying the eye drops for the past 2 days because my eye keeps getting red, even though I have no pain and wearing glasses.