Haridra Khand is a very famous and highly effective Ayurvedic medicine for allergy. It is in granules form. Its main ingredient is Haridra – turmeric. It is also known as Haridra Khand, Haridra Khandam.
Haridra Khand benefits: 
It is used widely in the treatment of allergic skin diseases, itching skin diseases. It improves skin quality and complexion.
Kandu – itching skin disorders, pruritis
Visphota – blisters
Dadru – fungal skin infections
Sheetapitta, Kotha – allergic skin conditions, hives
Udarda – skin diseases due to skin contact with cold objects
Ayurveda practitioners also suggest this for the treatment of
Allergic hives
Allergic dermatitis
Allergic rhinitis with cough due to change of place or change of season.
Melasma
Scalp itching, scalp psoriasis
Erythema annulare centrifugum
Blemishes, allergic dark spots, dermographism
Eosinophilia.