Blaschkolinear lichen nitidus: A rare presentation

Abstract

Lichen nitidus is an uncommon, chronic, usually asymptomatic papulosquamous dermatosis of unknown etiology, originally described by Felix Pinkus, a dermatopathologist in 1901. It generally presents as multiple, tiny, discrete, flesh-colored, dome-shaped papules most commonly on the extremities, genitalia, chest, and abdomen. We hereby report an uncommon and atypical presentation of “Blaschkolinear lichen nitidus” involving the trunk. A 15-year-old boy presented with a 1-year history of gradually progressive, multiple, small, raised lesions on the left side of the trunk. On examination, there were multiple, skin-colored to erythematous, discrete to confluent papules on the left side of the trunk in a curvilinear fashion. Dermoscopy, histopathology, and immunohistochemistry supported the clinical diagnosis of Blaschkolinear lichen nitidus. The patient was treated with topical steroid with good response.

Keywords

• Blaschkolinear
• immunohistochemistry
• lichen nitidus
• papulosquamous dermatosis