Thanks for writing to health care magic.
Presence of allergies in close relatives is one of the indicator that it could be because of allergy
Get your child examined by your doctor which will help in identification if that was because of allergy or not.
Identification of allergen and avoiding it is the best treatment.
Most of the cases the allergen is difficult to identify.
Antihistaminics prescribed by your doctor will be useful in case of allergies.
Hope this helps.