If it continues or comes and goes....then episcleritis may be the culprit. Not much you can do about it. I used to get it all the time and it would look like a diffused ,patchy redness. It would be on one side of the eye then go away and show up on the other side of the eye.... This went on for 7 years.

If your issue doesn't go away....or does and comes back then see a doc.