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Allergic Contact and Photoallergic Contact Dermatitis to Plant and Pesticide Allergens
Kenneth A. Mark, MD;
Ronald R. Brancaccio, MD;
Nicholas A. Soter, MD;
David E. Cohen, MD, MPH
Arch Dermatol. 1999;135:67-70.
Background The panel of patch test allergens used for the evaluation of patients with suspected photoallergy typically does not include plant and pesticide allergens. The prevalence of allergic contact dermatitis and photoallergic contact dermatitis to plant and pesticide allergens was determined for this subgroup of patients.
Observation Positive reactions were detected in 12 of 26 patients who were tested with our photoallergen series: 5 with allergic contact dermatitis, 5 with photoallergic contact dermatitis, and 2 with both. Four of the 12 patients had positive patch and photo-patch test reactions to plant allergens, pesticide allergens, or both. The positive patch test reactions were to the plants Taraxacum officinale (dandelion) and Tanacetum vulgare (tansy) and to the pesticides folpet and captafol. Positive photo-patch test reactions were to the pesticides folpet and captan. The histories of the patients suggested that 2 or 3 of the 4 patients had clinically relevant reactions. In the other 8 patients, positive reactions to the patch and photo-patch tests included fragrances, sunscreens, and antibacterial agents.
Conclusion Plant and pesticide allergens should be included in the patch and photo-patch test series used for the evaluation of patients with suspected photoallergy.
From the Occupational and Environmental Dermatology/Allergy Section and the Photomedicine Section of the Charles C. Harris Skin and Cancer Pavilion, the Ronald O. Perelman Department of Dermatology, New York University School of Medicine, New York.
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