TY - CHAP M1 - Book, Section TI - Lichen Planus A1 - Dooley-Hash, Suzanne A1 - Knoop, Kevin J. A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Lichen planus is a recurrent inflammatory condition that can affect any area of skin, mucosa, nails, and scalp. Although the etiology is unknown, it is often associated with autoimmune diseases suggesting an autoimmune cause. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/10/15 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181041624 ER -