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Dermoscopy in general dermatology (non-neoplastic dermatoses) of skin of colour: a comparative retrospective study by the International Dermoscopy Society Volume 30, numéro 6, November-December 2020

Illustrations

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Tableaux

Auteurs
1 Institute of Dermatology, “Santa Maria della Misericordia University Hospital, Udine, Italy
2 Department of Dermatology, Venereology and Leprosy, SN Medical College, Bagalkot, Karnataka, India
3 Skinnocence, Skin Clinic & Research Center, Gurugram, India
4 Department of Dermatology & STD, Patna Medical College & Hospital, Patna, India
5 Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
6 Department of Otolaryngology–Head & Neck Surgery, Aristotle University, Thessaloniki, Greece
7 Department of Dermatology, Armed Forces Medical College, Pune, India
8 Department of Dermatology, Command Hospital (Eastern Command), Kolkata, India
9 Faculty of Dermatology, College of Medicine, Kind Faisal University, Al Ahsa, Saudi Arabia
10 Department of Dermatology, All India Institute of Medical Sciences, Raipur, India
11 Dermatology Department, Cheikh Khalifa International University Hospital, Mohammed VI University of Health Sciences (UM6SS), Casablanca, Morocco
12 Department of Dermatology, Ankara University, School of Medicine, Ankara, Turkey
13 Dermatology Department, Instituto de Investigaciones Médicas A. Lanari, University of Buenos Aires, Argentina
14 Department of Dermatology, Venereology and Leprology, Government Medical College, Srinagar, University of Kashmir, Jammu and Kashmir, India
15 Dermatology Department, Cairo University, Egypt
16 Skin-Aid Clinic, Gurugram, India
17 Department of Dermatology and Venereology, Pramukshwami Medical College, Karamsad, Gujarat, India
18 Medical Trust Hospital, Cochin, Kerala, India
19 Second Dermatology Department, Aristotle University of Thessaloniki, Greece
20 Department of Dermatology and Venereology, University of Trieste, Trieste, Italy
21 First Department of Dermatology, Aristotle University, Thessaloniki, Greece
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Background: Dermoscopy has been shown to be a useful supportive tool to assist the diagnosis of several non-neoplastic dermatoses (i.e. inflammatory, infiltrative and infectious skin diseases), yet data on skin of colour is still limited. Objectives: To characterize dermoscopic features of non-neoplastic dermatoses in dark-skinned patients in order to identify possible clues that may facilitate the differential diagnosis of clinically similar conditions. Materials & Methods: Members of the International Dermoscopy Society were invited to submit cases of any non-neoplastic dermatosis developing in patients with Fitzpatrick Phototypes V-VI whose diagnosis had been confirmed by the corresponding gold standard diagnostic test. A standardized assessment of the dermoscopic images and a comparative analysis according to clinical presentation were performed. Seven clinical categories were identified: (I) papulosquamous dermatoses; (II) facial hyperpigmented dermatoses; (III) extra-facial hyperpigmented dermatoses; (IV) hypopigmented dermatoses; (V) granulomatous dermatoses; (VI) sclerotic dermatoses; and (VII) facial inflammatory dermatoses. Results: A total of 653 patients (541 and 112 with Phototype V and VI, respectively) were recruited for the analysis. Thirty-six statistically significant dermoscopic features were identified for papulosquamous dermatoses, 24 for facial hyperpigmented disorders, 12 for extra-facial hyperpigmented disorders, 17 for hypopigmented disorders, eight for granulomatous dermatoses, four for sclerotic dermatoses and 17 for facial inflammatory diseases. Conclusion: Our findings suggest that dermoscopy might be a useful tool in assisting the diagnosis of clinically similar non-neoplastic dermatoses in dark phototypes by revealing characteristic clues. Study limitations include the retrospective design, the lack of a direct dermoscopic-histological correlation analysis and the small sample size for less common diseases.