BackgroundBirch tar is obtained from birch (Betula verrucosa). It is a dark brown liquid that contains phenol, cresol, xylenol, guaiacol, creosol, and pyrocatechol. It is used as a component of pharmaceutical preparations.
Rothenberg and Hjorth found that positive patch-test reactions to a mixture of wood tars consisting of pine, juniper, beech, and birch often produce false-positive reactions. When a mixture of wood tars is positive, each tar should be tested individually.
SynonymsBirch tar
Uses
Topical medications
Cross-ReactionsUnusual Reactions
Back to list of contact allergens
Referenties
| 1. |
Rothenborg HW, Hjorth N. Allergy
to perfumes from toilet soaps and detergents in patients with dermatitis.
Arch Dermatol 1968;97(4):417-21. |
| 2. |
Lahti A, Hannuksela M. Immediate contact allergy to birch leaves and sap. Contact Dermatitis 1980;6(7):464-465. |
Author(s):Allergology: background information on allergens.
ICD10: L23.9