Scabies

From dermoscopedia

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 Editor: Aimilios Lallas

 Author(s): Aimilios Lallas
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The typical dermoscopic pattern of scabies consists of small dark brown triangular structures located at the end of whitish structureless lines (curved or wavy), giving an appearance reminiscent of a delta-wing jet with contrail (Fig 9a).[1] Microscopically, the brown triangle corresponds to the pigmented anterior part of the mite, while the burrow of the mite correlates dermoscopically to the contrail feature.

Scabies 3.png


Scabies 2.png


Since then, the value of dermoscopy in diagnosis of scabies has been extensively investigated in several studies.[2][3][4][5] The diagnostic accuracy of the technique was reported to be at least equal to traditional ex-vivo microscopic examination (i.e. skin scraping), while additional comparative advantages of dermoscopy include its non-invasiveness and lower requirements in terms of time, costs and experience.[4][5] Nowadays, dermoscopy has replaced ex-vivo microscopy as the routine method for diagnosis of scabies in several dermatology centers. Additional to its value for diagnosis, dermoscopy may also be useful in treatment monitoring, heralding treatment success when dermoscopic ‘jet with contrail’ features can no longer been detected.[6]

Dermoscopy of Scabies mite alive starting a borrow in the skin

  1. Argenziano et al.: Epiluminescence microscopy. A new approach to in vivo detection of Sarcoptes scabiei. Arch Dermatol 1997;133:751-3. PMID: 9197830.
  2. Bauer et al.: Nodular scabies detected by computed dermatoscopy. Dermatology (Basel) 2001;203:190-1. PMID: 11586026.
  3. Prins et al.: Dermoscopy for the in vivo detection of sarcoptes scabiei. Dermatology (Basel) 2004;208:241-3. PMID: 15118379. DOI.
  4. 4.04.1 Walter et al.: Comparison of dermoscopy, skin scraping, and the adhesive tape test for the diagnosis of scabies in a resource-poor setting. Arch Dermatol 2011;147:468-73. PMID: 21482897. DOI.
  5. 5.05.1 Park et al.: The diagnostic accuracy of dermoscopy for scabies. Ann Dermatol 2012;24:194-9. PMID: 22577271. DOI.
  6. Hamm et al.: Treatment of scabies with 5% permethrin cream: results of a German multicenter study. J Dtsch Dermatol Ges 2006;4:407-13. PMID: 16686608. DOI.