{{Infobox medical condition (new) | name = | image = Verruca plana (flat warts) on the chin.jpg | image_size = | caption = Verruca plana (flat warts) on the chin of a middle-aged woman | pronounce = | field = | synonyms = Verruca plana | symptoms = | complications = | onset = | duration = | types = | causes = | risks = | diagnosis = | differential = | prevention = | treatment = | medication = | prognosis = | frequency = | deaths = }}

'''Flat warts''', technically known as '''verruca plana''', are reddish-brown or flesh-colored, slightly raised, flat-surfaced, well-demarcated [[papule]]s of 2 to 5&nbsp;mm in diameter. Upon close inspection, these [[lesion]]s have a surface that is "finely verrucous".<ref name="Bolognia">{{cite book |author=Rapini, Ronald P. |author2=Bolognia, Jean L. |author3=Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set |publisher=Mosby |location=St. Louis |year=2007 |pages=1188 |isbn=978-1-4160-2999-1 }}</ref><ref name=PD>Lookingbill, Donald, et al. ''Principles of Dermatology''. Saunders. 2000. Pages 68-69. {{ISBN|0-7216-7971-4}}.</ref> Most often, these lesions affect the hands, legs, or face, and a linear arrangement is not uncommon.<ref name=PD/> At [[histopathology]], flat warts have cells with prominent [[perinuclear vacuolization]] around [[pyknosis|pyknotic]], [[basophilic]], centrally located nuclei that may be located in the [[Stratum granulosum|granular layer]].<ref name=Aboud2019>{{cite book|chapter-url=https://www.ncbi.nlm.nih.gov/books/NBK431047/|title=Wart (Plantar, Verruca Vulgaris, Verrucae)|vauthors=Al Aboud AM, Nigam PK|chapter=Wart|year=2021|publisher=StatPearls|pmid=28613701 }} Last Update: May 13, 2019.</ref> These are referred to as "owl's eye cells."<ref name=Aboud2019/> ==Additional images== <gallery> Micrograph of a flat wart.jpg|Micrograph of a flat wart Riehl Zumbusch Tafel X (1).jpg|Woman with extensive flat warts on her face </gallery> {{clear}}

== References == {{Reflist}}

== External links == {{Medical resources | DiseasesDB = | ICD10 = {{ICD10|B07}} | ICD9 = {{ICD9|078.19}} | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = | eMedicineTopic = | MeshID = }}

{{Viral cutaneous conditions}}

[[Category:Virus-related cutaneous conditions]] [[Category:Papillomavirus-associated diseases]]

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