Active Sensitization Caused by Elecampane (Inula Helenium)

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Patch testing with a new patch test series comprising 29 plant extracts and 16 purified plant allergens sensitized a patient. Retesting indicated thatInula helenium(elecampane, 1% petrolatum) caused the sensitization. It is emphasized that elecampane should be patch tested at a lower concentration, and we suggest 0.1% for patch testing. Patients should be informed to report late flare-up patch test reactions to obtain more information about active sensitization.

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