Allergy is the sudden change of condition in the normal body of those men who inhale, eat or touch any unsuitable foreign substances or physical agents. For example- dust particles, smell of ripe grass, rose flower, eating of eggs, fish, cooked animal food and drinking of milk, cool drinks, cold hot exposure, exposure of perspired body etc are the examples of physical agents- which causes allergy to some individuals and not to majority of people.

Dust allergy due to inhaling of dust particles, hay asthma or cold catarrhal allergy due to inhaling of the smell of ripe grass and skin allergy due to gastric distubances. In skin allergy, there is some eruption, reddening, swelling, burning and itching of the skin. Uricaria worse by food, cold and hot exposure with sudden puffing, swelling of skin in isolated spots-as if some bees have stung causing great burning itch-also come under skin allergy.

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