Allergies occur when your immune system reacts to a foreign body. Foreign body may be medicine, pollen, animal dander, dust, plant, fungus and insect venom etc. When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn t. When you come into contact with the allergen, your immune system s reaction can inflame your skin, sinuses, airways or digestive system. According to test result, your son is allergic to following: 1. Dermatophagoides pteronyssinus – house dust mite 2. Dermatophagoides farina – house dust mite 3. Penicillium chrysogen – fungus 4. Cladosporium herbarum – fungus 5. Aspergillus fumigates – fungus 6. Alternaria alternate – fungus 7. Common silver birch – plant Advice 1. Avoid above mentioned allergens. 2. Tablet levocetirizine 5 mg – 1 tablet once daily and tablet dexamethasone 0.5 mg – 1 tablet twice daily for 5 days when allergic symptoms occurs. Use half dose if your son is less than 12 years old. 3. Immediately go to hospital if you have any sign of anaphylaxis such as breathing difficulty, low blood pressure, nausea/vomiting, throat constriction, unconsciousness etc Thanks!!