Food allergy is not uncommon among small children. Cow milk and eggs are most frequently incriminated as the major cause of food allergy. A 4-month-old female infant who did not have a previous history of contact with the egg developed anaphylactic shock when an emulsion of raw egg white was rubbed on the buttock by her mother to relieve erosive diaper dermatitis. She had been fed on breast milk. She had no past medical history of any other allergy and no family history of atopy, asthma or allergic rhinitis. Her IgE PRIST was 29.46 IU/ml and multiple antigen simultaneous testing chemiluminescent assay for food specific IgE antibody showed a level 4 positive value only to egg white.