Dermatology: Practical and Conceptual Image Letter | Dermatol Pract Concept. 2025;15(2):5441 1 Applications of UV-Induced Fluorescence (UVF) Dermoscopy in Infectious Dermatoses (UVF-Infectiouscopy) Noemi Plozner1, Yasmeen J Bhat2, Enzo Errichetti1 1 Institute of Dermatology, Department of Medical Area, University of Udine, Udine, Italy 2 Department of Dermatology, Venereology and Leprology, Government Medical College, University of Kashmir, Srinagar, Jammu and Kashmir, India Citation: Plozner N, Bhat YJ, Errichetti E. Applications of UV-Induced Fluorescence (UVF) Dermoscopy in Infectious Dermatoses (UVF-Infectiouscopy). Dermatol Pract Concept. 2025;15(2):5441. DOI: https://doi.org/10.5826/dpc.1502a5441 Accepted: April 30, 2024; Published: April 2025 Copyright: ©2025 Plozner et al. This is an open-access article distributed under the terms of the Creative Commons Attribution- NonCommercial License (BY-NC-4.0), https://creativecommons.org/licenses/by-nc/4.0/, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original authors and source are credited. Funding: None. Competing Interests: None. Authorship: All authors have contributed significantly to this publication. Corresponding Author: Dr Noemi Plozner, MD, Institute of Dermatology, Department of Medicine, University of Udine, Piazzale Santa Maria della Misericordia, 15. 33100 – Udine, Italy. ORCID ID: 0009-0006-0212-4818. E-mail: noemiplozner@hotmail.it Case Presentations We present four instances of skin infections, including Microsporum spp-related tinea capitis (Case 1), pediculosis capitis (Case 2), perioral dermatitis-like demodicosis (Case 3), and scabies (Case 4. All were confirmed by either culture (Case 1) or microscopy examination (Cases 2-4) (Figures 1A-D). In each case, polarized dermoscopy (Figures 1E-H) showed some features, such as unspecific white scaling (Cases 1 and 3), numerous nits difficult to evaluate in terms of viabil- ity (Case 2), and serpiginous gray tract (Case 4). Instead, UV- induced fluorescence dermoscopic assessment (Figures 1I-L) revealed Microsporum spp-related green fluorescence in Case 1, numerous nits with clearly evident viable lice in some of them in Case 2, protruding follicular plugs in Case 3, and ser- piginous bluish tract with a green dot in Case 4. All findings were characteristic of the aforementioned diagnoses. Teaching Point UV-induced fluorescence (UVF) dermoscopy is a novel imaging technique that has shown to highlight several features not visible to either the naked eye or polarized dermoscopic assessment.1 This report emphasizes the use- fulness of UVF-dermoscopy in evaluating tinea capitis, pediculosis capitis, demodicosis, and scabies. In partic- ular, such a technique may reveal green fluorescence in Microsporum spp-related tinea capitis, thus helping to dis- criminate it from instances due to Trichophyton spp, which typically do not display green fluorescence. Additionally, UVF- dermoscopy may also facilitate the view of structures which could be sometimes difficult to detect on polarized dermoscopy, including viable nits in pediculosis, protruding follicular plugs in demodicosis, and mite body (green dot) in scabies. 2 Image Letter | Dermatol Pract Concept. 2025;15(2):5441 Figure 1. Tinea capitis: (A) Clinical image shows scaling and hair loss, (B) polarized dermoscopy reveals unspecific white scaling, and (C) UVF-dermoscopy highlights green fluorescence characteristic of Microsporum spp. Pediculosis capitis. (D) Clinical image displays nits, (E) polarized dermoscopy shows numerous nits, with viability difficult to assess, and (F) UVF-dermoscopy clearly reveals viable lice within nits (arrows). Perioral dermatitis-like demodicosis: (G) Clinical image shows perioral erythema and scaling, (H) polarized dermoscopy displays unspecific white scaling, and (I) UVF-dermoscopy demonstrates protruding follicular plugs. Scabies: (J) Clinical image displays a scratch- induced lesion, (K) polarized dermoscopy shows the serpiginous gray tract, and (L) UVF-dermoscopy reveals a bluish serpiginous tract with a green dot, representing the mite body (better seen in the inset—arrow). Image Letter | Dermatol Pract Concept. 2025;15(2):5441 3 A multicentric retrospective comparative study. J Eur Acad Dermatol Venereol. 2025 Jan;39(1):97-108. DOI: 10.1111 /jdv.19795. PMID: 38288676. References 1. Errichetti E, Pietkiewicz P, Bhat YJ, Salwowska N, Szlązak P, Stinco G. Diagnostic accuracy of ultraviolet-induced fluorescence dermoscopy in non-neoplastic dermatoses (general dermatology):