Blink sign

From dermoscopedia

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 Authored by: Ralph P. Braun     ·  Ashfaq A. Marghoob

 Keywords:   polarized light · non polarized light · blink sign
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Description In this chapter we describe the blink signWhile toggling between polarized and non polarized light, the structures that are more visibile with either one type of light will be enhanced and though blink at you in dermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections.
Author(s) Ralph P. Braun · Ashfaq A. Marghoob
Owner Ralph Braun→ send e-mail
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Status update June 12, 2017
Status by Ralph P. Braun


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Certain dermoscopic structuresThis glossary term has not yet been described. are more conspicuous with nonpolarized dermoscopy (NPD), while othersThis glossary term has not yet been described.This glossary term has not yet been described. are more conspicuous with polarized dermoscopy (PD)[1] .
The introduction of hybrid dermoscopes now allow the user to toggle between polarized and nonpolarized light. We found that structuresThis glossary term has not yet been described. that are more conspicuous with either NPD or PD appear to “blink” when the observer toggles between light modes[2].
In our experience, the presence of crystalline structures, which can easily be confirmed via the blink sign, can assist in detecting amelanotic and nodular melanomaThis glossary term has not yet been described., thereby increasing diagnostic sensitivityThis glossary term has not yet been described.. The presence of multiple milia cysts, which can also easily be seen via the blink testThis glossary term has not yet been described., increases diagnostic specificityThis glossary term has not yet been described. by helping to correctly identify seborrheic keratosisThis glossary term has not yet been described..




ReferencesThis is material contained in a footnote or bibliography holding further information.
  1. Benvenuto-Andrade et al.: Differences between polarized lightThis glossary term has not yet been described. dermoscopy and immersionThis glossary term has not yet been described. contact dermoscopy for the evaluation of skin lesions. Arch Dermatol 2007;143:329-38. PMID: 17372097. DOI.
  2. Braun et al.: The "blink sign" in dermoscopy. Arch Dermatol 2011;147:520. PMID: 21482914. DOI.