Chapter 33

Lichen Planus

Vibhu Mendiratta

Vibhu Mendiratta

Lady Hardinge Medical College and associated hospitals, New Delhi, India

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Sarita Sanke

Sarita Sanke

Lady Hardinge Medical College and associated hospitals, New Delhi, India

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First published: 20 November 2019

Summary

Lichen planus (LP) is a papulosquamous autoimmune T-cell-mediated disease that affects skin, mucous membranes, hair follicles and nails. It affects all age groups including children. Childhood LP cases can be sporadic or familial. Classic LP is characterized by faintly erythematous, violaceous, flat-topped, polygonal papules that are characteristically pruritic. White crisscrossing lines called Wickham's striae are seen on the surface. Several clinical variants are recognized according to the configuration of the lesions, their morphological appearance and the site involved. Vacuolar degeneration of the basement membrane with a band-like lymphocytic infiltrate at the dermoepidermal junction constitutes a histopathological hallmark. Classic, hypertrophic, annular and linear LP are the common childhood variants. LP is multifactorial in origin and is thought to be a T-cell-mediated injury to the basement membrane which results from infections, drugs and vaccinations. The lesions may last for up to 1–2 years, but the hypertrophic, mucosal, nail and follicular LP variants may last significantly longer. The nail and follicular variants can lead to the scarring processes of anonychia and cicatricial alopecia, respectively. Treatment is multidimensional and includes topical corticosteroids and calcineurin inhibitors, as well as systemic medications including nonsteroidal anti-inflammatory agents, systemic steroids, dapsone, methotrexate, ciclosporin (cyclosporine), azathioprine and phototherapy. This chapter outlines the clinical profile, aetiopathogenesis, course and treatment options in childhood LP.

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