I have a white spot on the edge of my iris, the white of the eye in the surrounding area is red and my eye is sore. I ve had this happen in the same eye before but in a different hemisphere. Sometimes it comes and goes and can be quite sore when it feels swollen. Someone thought it might be allergies, but in one eye? I never have experienced this with allergies before, but I go to college now in a different climate than where I grew up.
So there a be pollen affecting your eye sometimes there are fixed spots and allergy occurs in that particular spot when the allergen is exposed so it is possible you have spots in one eye and those spots aggravation exposure to allergens get confirmed from a doctor as these are sensitive areas and should not be treated by self med