Very good medicine for allergy is there in Ayurveda. First get AEC blood test done.
This needs treatment for long time. It is associated with low immunity.
Ask your friend to eat amla, (gooseberry ),
vitamin C rich foods.
Next Steps
Haridrakhanda 1tsp in warm milk daily at night after food.
Laghu soothashekara rasa 1 1 1
Munistamine tablet 2 0 2 (Muniyal Ayurveda)
Take these medicines continuously for 3 months.
Health Tips
Consult me online through this platform. Also send me the reports after getting that test done. It's the blood test for allergy.