My for year old has had a bubble that sort of looks like a blister in the white part of his left eye for over a year now and the things I've been able to find on the internet say, for the most part, that it's harmless and will go away on is own. I'm afraid that since it's clearly not going away and he's so young, that it may start causing damage as he grows. Does anyone know what it could be and if I need to take him to an opthalmologist?