I have had this in several of my buns and for different reasons, it is an infection but usually not the main one. i have had it because of a misformed tear duct, snuffles, front tooth roots being too long, abcess' and osteo mysytis (bone abcess) every bun i have had it in has had to have eye drops baytril and flushings to keep them clear and i have found everyone to be very difficult to clear up and keep clear.