# Flat wart

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Medical condition

Flat wart Other names Verruca plana Verruca plana (flat warts) on the chin of a middle-aged woman Specialty Dermatology

**Flat warts**, technically known as **verruca plana**, are reddish-brown or flesh-colored, slightly raised, flat-surfaced, well-demarcated [papules](/source/Papule) of 2 to 5 mm in diameter. Upon close inspection, these [lesions](/source/Lesion) have a surface that is "finely verrucous".[1][2] Most often, these lesions affect the hands, legs, or face, and a linear arrangement is not uncommon.[2] At [histopathology](/source/Histopathology), flat warts have cells with prominent [perinuclear vacuolization](/source/Perinuclear_vacuolization) around [pyknotic](/source/Pyknosis), [basophilic](/source/Basophilic), centrally located nuclei that may be located in the [granular layer](/source/Stratum_granulosum).[3] These are referred to as "owl's eye cells."[3]

## Additional images

		- Micrograph of a flat wart

		- Woman with extensive flat warts on her face

## References

1. **[^](#cite_ref-Bolognia_1-0)** Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). *Dermatology: 2-Volume Set*. St. Louis: Mosby. p. 1188. [ISBN](/source/ISBN_(identifier)) [978-1-4160-2999-1](https://en.wikipedia.org/wiki/Special:BookSources/978-1-4160-2999-1).

1. ^ [***a***](#cite_ref-PD_2-0) [***b***](#cite_ref-PD_2-1) Lookingbill, Donald, et al. *Principles of Dermatology*. Saunders. 2000. Pages 68-69. [ISBN](/source/ISBN_(identifier)) [0-7216-7971-4](https://en.wikipedia.org/wiki/Special:BookSources/0-7216-7971-4).

1. ^ [***a***](#cite_ref-Aboud2019_3-0) [***b***](#cite_ref-Aboud2019_3-1) Al Aboud AM, Nigam PK (2021). ["Wart"](https://www.ncbi.nlm.nih.gov/books/NBK431047/). *Wart (Plantar, Verruca Vulgaris, Verrucae)*. StatPearls. [PMID](/source/PMID_(identifier)) [28613701](https://pubmed.ncbi.nlm.nih.gov/28613701). Last Update: May 13, 2019.

## External links

Classification D ICD-10: B07 ICD-9-CM: 078.19

v t e Skin infections, symptoms and signs related to viruses DNA virus Herpesviridae Alpha. HSV Herpes simplex Herpetic whitlow Herpes gladiatorum Herpes simplex keratitis Herpetic sycosis Neonatal herpes simplex Genital herpes Cold sore Eczema herpeticum Herpetiform esophagitis Herpetic gingivostomatitis B virus B virus infection VZV Chickenpox Herpes zoster Herpes zoster oticus Ophthalmic zoster Disseminated herpes zoster Zoster-associated pain Modified varicella-like syndrome Beta. Human herpesvirus 6/Roseolovirus Exanthema subitum Roseola vaccinia Cytomegalic inclusion disease Gamma. Kaposi's sarcoma-associated herpesvirus Kaposi's sarcoma Poxviridae Ortho. Variola Smallpox Alastrim Monkeypox virus Monkeypox Cowpox Vaccinia virus Vaccinia Generalized vaccinia Eczema vaccinatum Progressive vaccinia Buffalopox Para. Farmyard pox: Milker's nodule Bovine papular stomatitis Pseudocowpox Orf Sealpox Other Yatapoxvirus: Tanapox Yaba monkey tumor virus Molluscum contagiosum virus Papillomaviridae HPV Wart/plantar wart Heck's disease Genital wart giant Laryngeal papillomatosis Butcher's wart Bowenoid papulosis Epidermodysplasia verruciformis Verruca plana Pigmented wart Verrucae palmares et plantares Bovine papillomavirus Equine sarcoid Parvoviridae Parvovirus B19 Erythema infectiosum Reticulocytopenia Papular purpuric gloves and socks syndrome Polyomaviridae Merkel cell polyomavirus Merkel cell carcinoma RNA virus Paramyxoviridae MeV Measles Matonaviridae Rubella virus Rubella Congenital rubella syndrome ("German measles") Togaviridae Alphavirus infection Chikungunya fever Picornaviridae Coxsackie A virus Hand, foot, and mouth disease Herpangina Foot-and-mouth disease virus Boston exanthem disease Ungrouped Asymmetric periflexural exanthem of childhood Post-vaccination follicular eruption Lipschütz ulcer Eruptive pseudoangiomatosis Viral-associated trichodysplasia Gianotti–Crosti syndrome

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