I thought I had a stye on my eye. I had one before and it itched a bit. The doctor did no testing and handed me a prescription for anti-biotics (oral and topical). The next day it was larger. I thought it looked like a cold sore blister and then someone at work said the same thing. I searched online for "herpes on the eye" and found shingles/herpes zoster. It didn't quite look like this, but by the next day and the way it was behaving, I was sure it was some sort of herpes virus. It swelled over-night and decreased in size during the day with minor itching sensation.
I had stopped the anti-biotics because they clearly weren't working.
I called the doctor and told her that I thought it was herpes, but she didn't believe me. She insisted that it wasn't herpes zoster, but agreed to do a culture. Sure enough, it was herpes simplex one, ON MY EYE! So, you can get cold sores on your eye. Who would have thought?