Dermoscopy of black-spot poison ivy

Rader, Ryan K.; Mu, Ruipu; Shi, Honglan; Stoecker, William V.; Hinton, Kristen A.

doi:10.5070/d308f5c7s0

Cited by 2 publications

(1 citation statement)

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“…12,13 Dermoscopy reveals a jagged, homogeneous, brown lesion with a red rim, suggesting uneven diffusion of urushiol within the stratum corneum. 14 The black spot tends to appear within 1 h of contact with urushiol and typically falls off in 1 to 2 wk. 15 Among those sensitive to urushiol, allergic symptoms after exposure are typically seen between 24 and 48 h, with a range of 5 h to 15 d. 16 While the most typical presentation of black-spot Toxicodendron dermatitis will have both the black dots and other classical signs of poison ivy dermatitis, 10 to 15% cases will only present with black spots in people who are not sensitive to urushiol.…”

Section: Introductionmentioning

confidence: 99%

Black-Spot Toxicodendron Dermatitis With Varied Presentation

Rabinovich

Barquin

Abernathy

et al. 2022

Wilderness & Environmental Medicine

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This article describes the clinical presentation, differential diagnosis, and treatment of 2 unrelated cases with different presentations of black-spot Toxicodendron dermatitis. In the first case, a healthy 7-y-old male presented with a rash consisting of black dots with localized surrounding erythema on the left arm. The rash then progressed to a vesicular, pinpoint, raised rash spreading to the face, arms, and neck. In the second case, a 4-y-old male presented with non-pruritic, black, flat, non-erythematous lesions that did not progress. This patient's older sibling had been diagnosed with poison ivy 1 wk prior, and they attended the same child care where the poison ivy was thought to be acquired. In both cases, diagnosis of black-spot Toxicodendron dermatitis was made. The black spot of Toxicodendron dermatitis is caused by urushiol oxidation on exposure to air. The subject may or may not go on to develop allergic contact dermatitis after the exposure. Diagnosis of this dermatitis is made on clinical presentation, with careful consideration of history, distribution, and lesion morphology. When allergic dermatitis does develop as in the first case, systemic treatment with oral steroids is recommended. In both of these cases the black dots completely resolved in 2 to 3 wk. Dermatologic referral for dermoscopy and biopsy may be necessary if the dermatosis does not resolve as anticipated.

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