An international survey of recalcitrant and recurrent tinea of the glabrous skin—A potential indicator of antifungal resistance

Background: There has been a global rise in cases of dermatophytosis and, in particular, recalcitrant and recurrent cases on tinea of the glabrous skin. This phenomenon, particularly prevalent in India, has been linked to the concerning rise of antifungal resistance. The challenge is amplified by a dearth of comprehensive, international data to understand the global scope and characteristics of such cases. Objectives: This study aims to collate international insights, focusing on areas outside Europe (as this was previously published), to map the extent and characteristics of clinical and, where possible, laboratory confirmed tinea of the glabrous skin through an online survey administered to dermatologists globally. Methods: An online survey was distributed from February 2022 to July 2023 and captured data on respondents' experience of recalcitrant and recurrent tinea of the glabrous skin over the preceding 3 years. Results: A total of 260 responses were received spreads across 36 countries, excluding Europe. In total, 91.7% reported seeing cases of recalcitrant or recurrent tinea of the glabrous skin over the preceding 3 years. Common anatomical sites affected were the trunk and groin. T. mentagrophytes and T. rubrum were the predominant species implicated, and there were low rates of laboratory confirmed dermatophyte resistance. Conclusions: The high rates of reported recalcitrant and recurrent tinea of the glabrous skin underscore an urgent need for global collaborative efforts and enhanced diagnostic measures. The findings advocate for the establishment of a standardized global disease registry, regulation of over‐the‐counter antifungal and steroid combinations, correlation of clinical suspicion with laboratory confirmed drug resistance and exploration of alternative therapeutic strategies to mitigate the burgeoning challenge of dermatophyte resistance

Concomitant Hidradenitis Suppurativa and Eruptive Xanthomas Presenting with Phimosis – The Importance of Timely Diagnosis

A 49-year-old man diagnosed with metabolic syndrome (MetS) was referred to us for treatment of xanthoma elements. Physical examination revealed widespread confluent yellow firm papules on his fingers, toes, arms, legs, and back. The diagnosis of eruptive xanthoma (EX) was clinically confirmed. During the examination of scar tissues, tombstone comedones and an inflammatory nodule was noted on his abdominal folds and right groin. These are diagnostic signs of hidradenitis suppurativa (HS), a condition the patient had reportedly suffered for 15 years without being diagnosed. The patient’s HS nodule was treated with intralesional triamcinolone injection, and prophylactic resorcinol was initiated, and he was referred to endocrinologists for xanthoma management. Three weeks later he returned due to newly developed lesions on his preputium, which caused a painful phimosis. Both HS and EX are correlated with MetS and causes increased all-cause cardiovascular mortality. As the average diagnostic delay of HS is 7.2 years, it is likely that timely diagnosis of HS would have identified the patient as being at risk of developing MetS. With proper preventive measures, the resulting EX lesions and increase in cardiac mortality could have been avoide

Concomitant Hidradenitis Suppurativa and Eruptive Xanthomas Presenting with Phimosis – The Importance of Timely Diagnosis

A 49-year-old man diagnosed with metabolic syndrome (MetS) was referred to us for treatment of xanthoma elements. Physical examination revealed widespread confluent yellow firm papules on his fingers, toes, arms, legs, and back. The diagnosis of eruptive xanthoma (EX) was clinically confirmed. During the examination of scar tissues, tombstone comedones and an inflammatory nodule was noted on his abdominal folds and right groin. These are diagnostic signs of hidradenitis suppurativa (HS), a condition the patient had reportedly suffered for 15 years without being diagnosed. The patient’s HS nodule was treated with intralesional triamcinolone injection, and prophylactic resorcinol was initiated, and he was referred to endocrinologists for xanthoma management. Three weeks later he returned due to newly developed lesions on his preputium, which caused a painful phimosis. Both HS and EX are correlated with MetS and causes increased all-cause cardiovascular mortality. As the average diagnostic delay of HS is 7.2 years, it is likely that timely diagnosis of HS would have identified the patient as being at risk of developing MetS. With proper preventive measures, the resulting EX lesions and increase in cardiac mortality could have been avoide

Increasing Terbinafine Resistance in Danish Trichophyton Isolates 2019–2020

Terbinafine resistance in Trichophyton species has emerged and appears to be increasing. A new EUCAST susceptibility testing method and tentative ECOFFs were recently proposed for Trichophyton. Terbinafine resistance and target gene mutations were detected in 16 Danish isolates in 2013–2018. In this study, samples/isolates submitted for dermatophyte susceptibility testing 2019–2020 were examined. Species identification (ITS sequencing for T. mentagrophytes/T. interdigitale species complex (SC) isolates), EUCAST MICs and squalene epoxidase (SQLE) profiles were obtained. Sixty-three isolates from 59 patients were included. T. rubrum accounted for 81% and T. mentagrophytes/T. interdigitale SC for 19%. Approximately 60% of T. rubrum and T. mentagrophytes/interdigitale SC isolates were terbinafine non-wildtype and/or had known/novel SQLE mutations with possible implications for terbinafine MICs. All infections with terbinafine-resistant T. mentagrophytes/interdigitale SC isolates were caused by Trichophyton indotineae. Compared to 2013–2018, the number of patients with terbinafine-resistant Trichophyton isolates increased. For T. rubrum, this is partly explained by an increase in number of requests for susceptibility testing. Terbinafine-resistant T. indotineae was first detected in 2018, but accounted for 19% of resistance (4 of 21 patients) in 2020. In conclusion, terbinafine resistance is an emerging problem in Denmark. Population based studies are warranted and susceptibility testing is highly relevant in non-responding cases

Two cases of proximal subungual onychomycosis caused by Trichophyton rubrum in HIV negative patients during treatment with TNF-α inhibitors combined with methotrexate.

Proximal subungual onychomycosis (PSO) is a rare subtype of onychomycosis with a clinical presentation characterized by proximal leukonychia in the lunular area of the nail. PSO is associated with immunosuppression and regarded a sign of Human Immunodeficiency Virus (HIV) infection when caused by Trichophyton (T.) rubrum. We present two cases of PSO caused by T. rubrumdeveloped during treatment with TNF-α inhibitors combined with methotrexate (MTX). </p

A Hundred Years of Diagnosing Superficial Fungal Infections:Where Do We Come From, Where Are We Now and Where Would We Like To Go?

Superficial fungal infections have been known for hundreds of years. During the 20(th) century new diagnostic methods were developed and the taxonomy changed several times, which, unfortunately, resulted in many fungi having several names (synonyms). The taxonomy is important, as species-specific identification guides clinicians when choosing the most appropriate antifungal agent, and provides an indication of the source of infection (anthropophilic, zoophilic or geophilic). Traditional diagnostic tests (direct microscopy, culture and histopathology) are still widely used, but molecular-based methods, such as PCR, have many advantages, and increasingly supplement or replace conventional methods. Molecular-based methods provide detection of different genus/species spectra. This paper describes recent changes in dermatophyte taxonomy, and reviews the currently available diagnostics tools, focusing mainly on commercially available PCR test systems