[Translated article] Dermoscopy in Patch Testing: How Can It Help?

Area of Science:

• Dermatology
• Allergology
• Dermoscopy

Background:

• Patch test interpretation is complex, with significant interobserver variability.
• Distinguishing weak allergic reactions from irritant reactions is often difficult.

Purpose of the Study:

• To investigate the dermoscopic features of patch test reactions.
• To assess the utility of dermoscopy in diagnosing doubtful patch tests.

Main Methods:

• Review of recent studies on dermoscopic features of patch test reactions.
• Analysis of dermoscopic findings in allergic versus irritant reactions.

Main Results:

• Allergic reactions show homogeneous erythema, dotted vessels, vesicles, crusts, and yellow-orange areas.
• Irritant reactions commonly present with pore patterns and perifollicular erythema.
• Dermoscopic features can differ between allergic and irritant patch test responses.

Conclusions:

• Dermoscopy offers valuable insights into patch test reactions.
• This technique may improve diagnostic accuracy for uncertain patch test results.