ArticleDermatology practical & conceptual2025
Assessing the Accuracy of Dermoscopy for Scabies Diagnosis in Dark African Skin.
Article in Dermatology practical & conceptual, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
introductionScabies, a parasitic infestation caused by Sarcoptes scabiei var hominis, affects individuals of diverse skin types. While definitive diagnosis involves identifying adult mites, eggs, or scybala from the microscopy of scrapings obtained from representative sites, it is invasive, time-consuming, and not feasible in very young or non-cooperative patients. Dermoscopy is an evolving non-invasive procedure useful in dermatological diagnosis. The handheld dermatoscope is portable and valuable for epidemics and in vivo use. There are sparse data on the diagnostic accuracy of dermoscopy versus microscopy in darker skin phototypes, a demographic for which dermoscopy have been understudied.
objectiveThis study aimed to compare the diagnostic accuracy of dermoscopy with microscopy in dark skin.
methodsConsecutive patients attending the dermatology clinic at Nnamdi Azikiwe University Teaching Hospital, Nnewi, Nigeria, with clinical suspicion of scabies underwent dermoscopic and microscopic examination. Definitive diagnosis was retrospective, and a comparative assessment between dermoscopy and microscopy was conducted.
resultsDermoscopic and microscopic evidence was observed in 48.3% and 46.7%, respectively. While the serpiginous tract had a sensitivity and specificity of 75.9% and 80.6%, respectively, delta sign was 75% and 55.4%, respectively. Both dermoscopy and microscopy demonstrated a sensitivity and specificity of 75% and 55.4%, respectively. The delta glider sign was seen in four participants.
conclusionDermoscopy is particularly effective in identifying the serpiginous tract of scabies on dark skin, although it is less effective for detecting the delta sign. Non-specific dermoscopic features may frequently be seen. Future studies should modify criteria for darker skin to enhance clinical accuracy.
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