Contact allergy and depigmentation from alstroemeria

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Abstract
Observations of combined sensitivity between Alstroemeria and Tulipa support the assumption that they contain identical sensitizing agents. A patient working as a gardener developed a dermatitis from Alstroemeria. Patch tests with Alstroemeria were positive, but patch tests with Tulipa were negative. The patient showed depigmented areas at the test sites and at the sites of a previous dermatitis 2 mo. after test application. The depigmented test areas remained unchanged at least a year after test application. Whether the depigmentation was due to some unique character of the molecular structure of the unknown Alstroemeria allergen, or to a unique biological characteristic of the patient, remains to be determined.