Hello! Because the condition is unilateral I think it is more likely to be an irritatant versus infection or allergy. I would keep the eye clean as Sarah mentions above and flush the eye copiously with sterile saline (like you would do if you were trying to flush out a piece of foreign material. Remember to get under the third eyelid by flushing under the inside edge of the eyelid in the inside corner of the eye. If the drainage persists, worsens or gets a yellow/green color or you see rubbing of the eye or squinting you should see your… Read more »