Table 4.

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

Category	Examples
Animals and their derivatives	- Caterpillars - Moths - Sea anemone - Coral
Drugs	- Capsaicin - Chloroform - Dimethyl sulfoxide - Nicotinic acid esters - Tar extracts - Tincture of benzoin
Food and food additives	- Some fish products - Runner bean - Tomato - Benzaldehyde - Cinnamic acid - Menthol - Vanillin - Cayenne pepper
Fragrances	- Anisyl alcohol - Cassia oil - Coumarin - Eugenol - Geraniol - Hydroxycitronellal - Benzophenone-3 - Resorcinol
Other chemicals and metals	- Naphtha - Sulfur
Plants and their derivatives	- Nettle - Turpentine
Preservatives	- Benzyl alcohol - Bronopol - Camphor - Chlorocresol - Sodium benzoate - Sorbic acid