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Table 1 Types of urticaria and causative agents

From: Urticaria: recommendations from the Italian Society of Allergology, Asthma and Clinical Immunology and the Italian Society of Allergological, Occupational and Environmental Dermatology

Type of urticariaCausative agent
AllergicFoods, drugs, Hymenoptera stings
Spontaneous urticariaUnknown
Inducible urticariaDermographism
Cold
Heat
Sunlight
Pressure
Vibration
Contact
Colinergic
Aquagenic