TY - CHAP M1 - Book, Section TI - Lichen Planus and Lichen Nitidus A1 - Bridges, Khari H. A2 - Kelly, A. Paul A2 - Taylor, Susan C. A2 - Lim, Henry W. A2 - Serrano, Ana Maria Anido PY - 2016 T2 - Taylor and Kelly's Dermatology for Skin of Color, 2e AB - KEY POINTSLichen planus is an autoimmune inflammatory mucocutaneous condition affecting the skin, mucosal surfaces, scalp, or nails.Evidence suggests that lichen planus is due to altered self-antigens on basal keratinocytes, a process that appears to be multifactorial.Lichen planus has a multitude of clinical variants, including some actinic variants that occur in darker skin types.Lichen nitidus is characterized by clusters of numerous, tiny, discrete, skin-colored, uniform, pinhead-sized papules.Histology of lichen nitidus reveals a ‘ball and claw’ arrangement.There is an actinic variant of lichen nitidus that occurs predominantly in people with more darkly pigmented skin. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - dermatology.mhmedical.com/content.aspx?aid=1161545460 ER -