Hello and thanks for your question. This can be due to several things. This can rarely be due to corneal problems such as corneal dystrophies
or infections. It cal also be due to inflammation inside the eye. All of these are quite uncommon however. Most often this is due to either dry eye
syndrome, allergic conjunctivitis, or spot that it is just a habit that the child has picked up. However, the only way that you could say that it was just a habit or a 'thing' that kids do is to have the child get a complete, dilated eye exam by an ophthalmologist
Does this information help address your concerns? Does this make sense? Do you have any other concerns that I haven't addressed?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.