Philodendron as a Cause of Contact Dermatitis

The value of patch testing with plants “as is” in diagnosing plant sensitization

“…1 and 10, but details of the Philodendron species were not available for the two last‐mentioned (Table 2). Ayres and Ayres stated that although the incidence of Philodendron dermatitis was “not great,” it seemed to occur more frequently than generally realised: our data support this notion 18 …”

“…Another possibility is commercial production of falcarinol. The Philodendron ‐sensitised patients all had occupational exposure, but as reported by Ayres and Ayres, 18 patients may become sensitised by their own Philodendron houseplants, and it is one of the plants to keep in mind in patients with recurrent plant dermatitis‐like lesions without an obvious cause.…”

“…Ayres and Ayres stated that although the incidence of Philodendron dermatitis was "not great," it seemed to occur more frequently than generally realised: our data support this notion. 18 The genus Monstera also belongs to the arum family and contains calcium oxalate crystals. 2,21 M. deliciosa, the Swiss-cheese plant, is an extremely popular pot plant, but clear-cut case reports are rare although the older literature states that the sap is "caustic and vesicant" and that the ripe fruit may cause urticaria.…”

“…Ayres 12 cases of sensitization to different Philodendron species, the majority being of non-occupational origin. 18 Later, cases were reported in for example Danish gardeners and Finnish plant keepers. 19,20 Philodendron species contain up to 0.7% calcium oxalate crystals, conveying an irritant potential.…”

“…In temperate climates, Philodendron cultivars are popular indoor plants. Ayres and Ayres reported 12 cases of sensitization to different Philodendron species, the majority being of non‐occupational origin 18 . Later, cases were reported in for example Danish gardeners and Finnish plant keepers 19,20 .…”