Toxicodendron radicans dermatitis

Mallory SB, Miller OF, Tyler WB (1982) Toxicodendron radicans dermatitis with black lacquer deposit on the skin. J Am Acad Dermatol 6 363-368... 

Black lacquer-like deposit on the skin in patients with Toxicodendron radicans dermatitis has been described. Histologically, the deposit material was identified in the stratum corneum (Mallory et al. 1982). These black spots were also mentioned by McNair (1923) to occur in two gardeners who let fresh sap fall on their hands. Table 4 contains an expanded list of chemicals that cause skin discoloration and staining. 

Ginkgo leaf contains ginkgolic acids (urushiol type alkylphenols), compounds that are related to those found in poison ivy Toxicodendron radicans) and associated with contact allergies, especially dermatitis. Ginkgolic acids are found in relatively high concentrations in ginkgo seed coats and in low concentrations in the leaf (Blumenthal 1997). 

Machaerium scleroxylon) in a hobbyist handling the wood. Plants reported to cause erythema multiformelike eruption include poison ivy (Toxicodendron) (Schwartz and Downham 1981 Mallory et al. 1982), primula Primula obconica) (Hjorth 1966) and mug-wort (Artemesia vulgaris) (Kurz and Rapaport 1979). Mallory et al. (1982) reported urticarial eruptions with black deposits on the skin of four patients with Toxidocendron radicans dermatitis. Urticaria, erythema multiforme-like eruptions, in a patient from Rhus dermatitis was reported by Schwartz and Down-ham (1981). They recommended that patients with such reactions should be screened for systemic involvement as previous reports have shown that nephritis can be an associated feature (Meneghini and AngeUni 1981 Fisher 1986). 

McNair JB (1923) Rhus dermatitis from Rhus toxicodendron radicans and diversibola (poison ivy). Its pathology and chemotherapy. University of Chicago Press, Chicago, pp 56-71... 

---