LAUSR

Editor, An otherwise healthy 34‐year‐old man presented with a 2‐ month history of pruritic erythematous, flat‐topped papules, and plaques. They were found to have a unilateral blaschkoid distribution on the left forearm, arm, and chest (Figure 1A and 1). The patient denied any drug intake or previous herpes zos‐ ter infection. Serologic tests for hepatitis B and C were negative. Dermoscopy revealed white lines with a reticular arrangement within a pink background, and peripheral dotted and coiled ves‐ sels (Figure 1C). Further reflectance confocal microscopy (RCM) was performed (Figure 2A‐D). Granular layer revealed enlarged keratinocytes with dark nucleus surrounded by bright cytoplasm corresponding to hy‐ pergranulosis. Bright, small round structures in between keratino‐ cytes and dendritic refractile structures, respectively correlating to lymphocytes and Langerhans cells, were also observed. At basal layer