High eosinophil count may be caused by allergy, parasitic infection, skin disease and other factors. 1. Allergy: for example, allergic rhinitis, allergic dermatitis, allergic diarrhea, etc. Generally, eosinophils will return to normal after allergic diseases are cured. 2. Parasitic infections: such as roundworms, schistosomiasis, etc. Eosinophils have the function of killing parasites, when the body appears parasites, eosinophils will also increase. 3. Skin diseases: for example, eczema, exfoliative dermatitis, etc., will cause mild to moderate elevation of peripheral blood eosinophils. If eosinophils are only slightly elevated during the examination, no special treatment is needed and regular review is sufficient. If you experience any discomfort, it is recommended that you go to the hospital for further examination to determine the cause of the disease.