What is the differential diagnosis for plant dermatitis? Immunoglobulin E tests eg, RAST for latex allergy.Tests may be undertaken to clarify or confirm the diagnosis. Plant dermatitis should be suspected clinically on history and examination. What are the complications of plant dermatitis? Postinflammatory hyperpigmentation is more pronounced in dark skin compared to fair skin.Erythema may be difficult to observe in skin of colour.How do clinical features vary in differing types of skin? Immunological eg, latex, the sap from rubber trees.Non-immunological, for example formic acid in stinging nettles.Skin reaction following contact is induced by UVA in sunlight.Furocoumarins (psoralens) eg, sap of cow parsnip, lime peel oil.Examples include primula, poison ivy, grevillea.Only affects someone with an immune-mediated allergy to it.Delayed (type 4) hypersensitivity reaction.Mechanical irritant eg, Bindii dermatitis.Chemical irritant such as seaweed toxins.Can affect anyone with sufficient exposure.From use of plant-based essential oils and fragrances found in topical applications, diffusers etc.Occupational including florists, farmers, chefs and food handlers, fruit pickers, and horticulturists.Airborne due to plant-associated aeroallergens, for example compositae allergy.Accidental contact such as brushing a rhus tree when walking past.Plant dermatitis can affect anyone in contact with the specific plant component including the sap, bark, wood, leaf, stem, flower, pollen, or fruit.
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