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Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus

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Black-Spot Toxicodendron Dermatitis With Varied Presentation.

Emily P Rabinovich¹, Jennifer N Barquin¹, Rebecca E Abernathy²

¹University of Virginia School of Medicine, Charlottesville, VA.

Wilderness & Environmental Medicine

|June 19, 2022

Summary

Black-spot Toxicodendron dermatitis presents differently in children. Prompt diagnosis based on clinical signs and lesion morphology is key for effective management of this urushiol-induced rash.

Keywords:

poison ivy pruritus rashes urushiol

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Area of Science:

Dermatology
Toxicology

Background:

Toxicodendron dermatitis, commonly known as poison ivy, oak, or sumac rash, is a widespread allergic contact dermatitis.
Black-spot Toxicodendron dermatitis is a less common presentation caused by oxidized urushiol, the plant's oil allergen.

Observation:

Two pediatric cases of black-spot Toxicodendron dermatitis exhibited distinct clinical presentations.
Case 1: A 7-year-old male presented with black dots progressing to a vesicular, raised rash with erythema.
Case 2: A 4-year-old male showed non-pruritic, flat, non-erythematous black lesions that did not evolve.

Findings:

Diagnosis of black-spot Toxicodendron dermatitis was confirmed in both cases based on clinical presentation, history, and lesion morphology.
The characteristic black spots result from the oxidation of urushiol upon air exposure.
Allergic contact dermatitis developed in one case, necessitating systemic corticosteroid treatment.

Implications:

This condition highlights the varied clinical spectrum of urushiol-induced dermatitis.
Accurate diagnosis relies on careful clinical evaluation, especially when typical presentations are absent.
Most cases of black-spot Toxicodendron dermatitis resolve within 2-3 weeks; persistent or atypical presentations may warrant further dermatologic investigation.