Am J Dermatopathol 2017 Feb;39(2):140-143
*Department of Dermatology, Lehigh Valley Health Network, Allentown, PA; †School of Osteopathic Medicine, Western University Health Sciences, Pomona, CA; and ‡Advanced Dermatology Associates, LTD, Allentown, PA.
Lichen planus (LP) is a mucocutaneous inflammatory dermatitis of idiopathic origin that can involve the skin, mucous membranes, hair, and nails. LP has an associated set of characteristic histopathologic findings which include hyperkeratosis, vacuolization of the basal layer, Civatte bodies, wedge-shaped hypergranulosis, band-like lymphocytic infiltrate at the dermal epidermal junction, eosinophilic colloid bodies in the papillary dermis, and pigment incontinence. The infiltrate is usually composed of lymphocytes with few histiocytes, mast cells, and macrophages. Read More