Contact allergy and medicinal herbs

Area of Science:

• Dermatology
• Phytotherapy
• Allergology

Background:

• Herbal treatments are increasingly used for internal and dermatological conditions.
• Contact sensitization to plants, particularly the Compositae family, is prevalent in Europe.
• Specific plants like arnica, elecampane, and tea tree oil are frequent sensitizers.

Purpose of the Study:

• To highlight the challenges in diagnosing plant allergies.
• To emphasize the limited knowledge regarding the allergenic potential of plants.
• To underscore the need for systematic investigation into the adverse effects of herbal medicines in dermatology.

Main Methods:

• Review of existing literature on herbal treatments and plant allergies.
• Analysis of sensitization prevalence data for various plant species.
• Discussion of diagnostic difficulties and risks associated with plant allergen testing.

Main Results:

• High prevalence of contact sensitization to certain plants in Europe.
• Difficulties in standardized patch testing due to limited commercial substances and risk of active sensitization.
• Many herbal substances lack regulatory approval and their efficacy is often questionable, while side effects are more apparent.

Conclusions:

• Adverse effects of herbal medicines are a significant, yet understudied, aspect of dermatology.
• Systematic investigation is crucial to understand and manage the risks associated with herbal treatments.
• Dermatologists should be aware of the potential for plant-induced contact dermatitis and other adverse reactions.