Did you have any kind of Vomiting or Loose motions suppressing meds in the past? That can b a cause.
Any other med which might have caused allergy?
Improper food which is not suitable for your bodytype. Improper digestion, Constipation etc can also b a cause.
Next Steps
Regular use of Anti-Allergy pills can harm your
liver and lead to some other issue. It's not a solution, just a temporary cover-up of the illness.
Health Tips
Ayurveda treats on the basis of the exact Cause, Doshas involved, individuals Lifestyle, Bodytype etc, hence it treats the Root Cause of d illness.