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Hi. Welcome to JustAnswer. My name is Uzair.I am reviewing your post and will get back to your reply momentarily.
There can be number of causes, common ones include trivial injury or inflammation and infection. Since it is in one eye and is not painful. There is nothing much to worry about.I would advise her to wash eye with cold water and observe as it would be alright in a day or two. In case of any pain or itching see your doctor.
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I hope your wife is feeling better now.
Please let me now if you have followup questions.