Last reviewed:September 2019
Last updated:March  2019

Summary

Definition

History and exam

Key diagnostic factors

  • presence of risk factors
  • pearly papule with a central dell

Other diagnostic factors

  • surrounding erythema
  • facial or groin distribution of lesions
  • pruritus
  • atopic dermatitis
  • sleep disturbance

Risk factors

  • close contact with an infected individual
  • sexual contact with an infected individual
  • HIV infection
  • tropical climate
  • swimming
  • atopic dermatitis

Diagnostic investigations

Investigations to consider

  • curettage biopsy
  • Tzanck stain
  • haematoxylin and eosin staining
  • HIV test
Full details

Treatment algorithm

Contributors

Professor of Primary Care Research

School of Medicine

Neuadd Meirionnydd

University Hospital of Wales

Cardiff

UK

Disclosures

NF declares that he has no competing interests.

Dr Francis would like to gratefully acknowledge Dr Nanette B. Silverberg, a previous contributor to this topic.

Peer reviewersVIEW ALL

Director of Cosmetic Dermatology

Department of Dermatology

Cosmetic and Procedural Dermatology

Henry Ford Health System

Detroit

MI

Disclosures

DMO declares that he has no competing interests.

Consultant Dermatologist

Aberdeen Royal Infirmary

Aberdeen

UK

Disclosures

None disclosed.

Staff Dermatologist

VA Medical Center

Minneapolis

MN

Disclosures

AB declares that she has no competing interests.

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