A case of isolated allergy to sheep's milk

Background A 6 year old boy came to our attention reporting two recent episodes of diffuse urticaria and eyelid and lip swelling, accompanied by a burning feeling of the oral mucosa and tingling of the throat. In the first episode symptoms appeared after ingestion of a dessert homemade by his grandma: a layer of dough (wheat flour, water and lard) filled with soft cheese and lemon juice, fried in peanut oil and covered by honey. In the second episode, again at his grandma’s, symptoms had a more rapid onset, after the very first bite of a compound made of cheese and parsley. From the age of 6 months the boy had had mild atopic dermatitis; at the age of 3 years he had undergone SPT which were positive for egg white, peanut and grass pollen. Since then he had been on a diet free of egg, peanut and tree nuts; he had recently started to eat baked products containing egg with no symptoms. The boy was commonly eating lemon juice, honey, parsley as well as cow’s milk and its derivates.