Hello.
Thank you for asking at HCM.
I went through your son's history.
In his case, I would first think of
food allergy causing
diarrhea and
atopic dermatitis.
As he does not have any respiratory complaints like
frequent cough & colds, I would not suspect he is reacting to mice droppings as they are usually inhaled as particles and affect respiratory system more.
I do not know diet of your son but the most common foods causing food allergy are - milk, peanut, tree nuts (cashew nut, almonds, pistachio, etc), soy, eggs, fish, shell fish & wheat. So please try to correlate his diet with his symptoms.
If you are not getting clues from above, I would suggest you to consult an Allergist who will ask the history in detail and suggest him allergy testing that might reveal the
substance causing allergy.
As his symptoms started 6 months back, I would not suspect any serious infection. However, I would suggest a stool examination for worm infestation, which also can cause such symptoms.
Hope this will be helpful to you.
Wish your son the best of the health.
Regards.