Hi, I have gone through your query. Normal AEC should be below 350. Your son has high AEC. This may be due to Autoimmune disease, Hay fever, Eczema, asthma. It can be due to parasite infection like worms. As the rashes are urticaria, he may be allergic to some food or to temperature change. Avoid the allergens you know about. He may be given a single dose of Albendazole for worms, antihistamine like levocetrizine for rashes and steroid like deflazacort, but only after consulting a local pediatrician and dermatologist. Do consider a positive feedback as a credit to my work. Let me know if you have any further questions.