Thanks for writing in to Healthcare Magic!
can be due to parasitic infection
in gut, filaria
infection in blood, allergic condition, asthma
A good approach would be to get investigations first- Get CBC, Peripheral blood smear detailed examination, Stool Examination, these investigations may give clues for the cause of eosinophilia.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!