Dermoscopy in Patch Testing: How Can It Help?

Interpreting patch test reactions is not easy. It requires experience and is characterized by high intraobserver and interobserver variability. It can sometimes be truly difficult to discern between a weak allergic reaction and an irritant reaction. A number of recent studies have investigated the d...

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Bibliographic Details
Published in:Actas dermo-sifiliográficas (English ed.) 2023-01, Vol.114 (1), p.54-59
Main Authors: Gil-Pallares, P, Navarro-Bielsa, A, González-Ruiz, A A, Silvestre, J F
Format: Article
Language:eng ; spa
Subjects:
Dermatitis, Allergic Contact - diagnosis
Dermatitis, Allergic Contact - etiology
Dermoscopy
Eczema
Erythema
Humans
Irritants
Patch Tests
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Summary:Interpreting patch test reactions is not easy. It requires experience and is characterized by high intraobserver and interobserver variability. It can sometimes be truly difficult to discern between a weak allergic reaction and an irritant reaction. A number of recent studies have investigated the dermoscopic features of patch test reactions. Homogeneous erythema is the main feature observed in patients with a positive allergic reaction, although dotted vessels, vesicles, crusts and yellow-orange areas may also provide clues. These features are somewhat similar to those observed in inflammatory conditions, such as eczema. In patients with an irritant reaction, the most common dermoscopic findings are the pore reaction pattern and perifollicular erythema. Dermoscopy could be useful for establishing a diagnosis in the case of doubtful patch test reactions.
ISSN:1578-2190
DOI:10.1016/j.ad.2022.03.005