This could be one of a few different things. This could be a conjunctival cyst, or a collection of fluid underneath the clear, transparent skin over the white of the eye. If this is the case, then it may take some time to resolve and lubrication (artificial tears and lubricating ophthalmic ointment) should help the symptoms.
This also may be an inflammed pingueculum, which is an aggregate or condensing of the conjunctiva next to the colored part of the eye. Occasionally these can become inflamed and require prescription drops to help overcome the inflammation.
This also could be a more significant inflammation of the episclera or sclera called scleritis.
Because so much of the decision-making process in the diagnosis of this kind of problem lies in the exam, it is difficult for me to know exactly which one of these things it is based on history alone.
Therefore, I would recommend, especially since this has been going on for awhile, to see an ophthalmologist for a definitive diagnosis. I suspect, however, that you may require prescription drops for resolution of the problem.
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Disclaimer: My opinion is solely informative and does not constitute an informed medical opinion or recommendation. For an informed medical opinion and/or recommendation you must see an eye doctor.