Table 3.

Common causes of immunologic contact urticaria reported in the literature [2]

Category	Examples
Animals and their derivatives	- Caterpillars - Dander - Jellyfish - Placenta, saliva, serum of some animals - Silk - Spider mite
Drugs	- Ampicillin - Bacitracin - Benzoyl peroxide - Cephalosporins - Neomycin - Penicillin - Streptomycin
Food and food additives	- Seafood - Cheese - Eggs - Milk - Onion - Coffee bean - Asparagus - Tomato - Nuts - Mushroom - Mustard - Some seeds and grains
Fragrances	- Balsam of Peru - Wool alcohol
Other chemicals and metals	- Acetone - Acrylic monomers - Formaldehyde resin - Chromium
Plants and their derivatives	- Algae - Cannabis - Colophony - Eucalyptus - Ficus - Lilies (Lilium) - Natural rubber latex - Poppy flowers - Tobacco - Tropical woods - Tulips
Preservatives and antimicrobials	- Alcohols - Chlorhexidine - Gentian violet - Sodium hypochlorite