Recent advances in understanding Propionibacterium acnes (Cutibacterium acnes) in acne [version 1; referees: 2 approved]

The skin commensal Propionibacterium acnes, recently renamed Cutibacterium acnes, along with the other major pathophysiological factors of increased seborrhea, hyperkeratinization of the pilosebaceous unit, and inflammation, has long been implicated in the pathogenesis of acne. Recent advances have contributed to our understanding of the role of P. acnes in acne. Although there are no quantitative differences in P. acnes of the skin of patients with acne compared with controls, the P. acnes phylogenic groups display distinct genetic and phenotypic characteristics, P. acnes biofilms are more frequent in acne, and different phylotypes may induce distinct immune responses in acne. P. acnes plays a further important role in the homeostasis of the skin’s microbiome, interacting with other cutaneous commensal or pathogenic microorganisms such as Staphylococcus epidermidis, Streptococcus pyogenes, and Pseudomonas species. In the era of increasing antimicrobial resistance, the selection of acne treatment targeting P. acnes and the prevention of antibiotic resistance play a key role in improving outcomes in acne patients and public health. © 2018 Platsidaki E and Dessinioti C

A Sensitivity Meta-Analysis of Disease-Specific Death in Localized Cutaneous Squamous Cell Carcinoma

Background: Patients with localized cutaneous squamous cell carcinoma (cSCC) have different risk for disease-specific death (DSD) from patients with metastatic cSCC. Patients and Methods: We conducted a sensitivity meta-analysis to identify the risk factors associated with DSD, in patients with localized cSCC at initial diagnosis (without locoregional or distant metastasis). Results: Nine studies, with 5,205 patients, were included. Median follow-up ranged from 18 to 81 months. The number of deaths due to cSCC ranged from 3 to 40. Patients with immunosuppression were almost 2 times more likely to die from cSCC compared to immunocompetent patients (risk ratio: 1.85, 95% CI: 1.32-2.61). There was a positive but nonsignificant overall association with DSD for depth beyond fat, tumor diameter, presence of perineural invasion, location, and thickness. These results should be interpreted with caution, as there was limited evidence-based data on DSD in localized cSCC, due to the small number of studies reporting DSD, the absence of reporting the margin status, the variability of selected risk factors across studies, and the variability of definition of risk factors. Conclusions: In our meta-analysis, in localized cSCC at initial diagnosis, patients with immunosuppression were at significantly higher risk to die from cSCC. Our findings further highlight the need for a standardized set of risk factors to be included in studies on prognosis of cSCC and for including margin status and DSD among the studied outcomes. © 2022 S. Karger AG, Basel. All rights reserved

Methotrexate: An effective monotherapy for refractory generalized morphea

Introduction: Morphea is an inflammatory skin disorder characterized by excessive collagen deposition. Although treatment algorithms for morphea subtypes have been suggested, no consistent recommendations are available. This study attempts to evaluate the clinical efficacy of methotrexate (MTX) as monotherapy in refractory generalized morphea. Methods: It is a retrospective study, including 20 patients who had already been treated with various topical and systemic therapies with minimal clinical improvement. Patients received orally MTX at a of dosage 15 mg once weekly. Duration of the use, dosage of MTX, and adverse events were recorded. Clinical assessment of skin lesions was performed and documented. Results: The mean disease duration was 27 months before the initiation of MTX treatment. After 12 months of therapy, very good response was achieved in 6 patients (30%), good response in 10 patients (50%), and fair response in 2 patients (10%), while 2 patients (10%) had failed treatment. Patients were followed up for a mean time interval of 21 months. No serious adverse event was recorded. Conclusion: MTX has been already proved to be an effective and well-tolerated treatment in pediatric patients with morphea. The majority of the group of adult patients showed very good and good improvement when treated with MTX. Although this is an uncontrolled study, MTX monotherapy was considered a safe and effective treatment for the management of this specific clinical subset of morphea in adults. © 2017 Platsidaki et al

Successful treatment of coexistent acne fulminans and severe hidradenitis suppurativa with adalimumab

The coexistence of hidradenitis suppurativa (HS) and acne fulminans (AF) has only recently been reported in the literature. We present a case of a 17-year-old man who presented with a 2 years history of severe acne and HS. He was initially started on oral clindamycin and rifampicin for 3 months with no clinical improvement. Acne lesions became worse with the presence of nodules and necrotic ulcers, while weight loss, low-grade fever, back and knee pain, and psychological distress were noted. We prescribed adalimumab in its standard dosing regimen. Remission of AF was achieved in 3 months, whereas adalimumab has not been as effective in treating the HS lesions. Its dosage was increased to 80 mg weekly and more than 80% clinical improvement of HS lesions was obtained in 2 months. The patient maintained on this dosage till this day and efficacy is sustained. TNF-α inhibitors are considered an effective option in the treatment of HS, while it has been also suggested as a treatment option in AF. Our patient was successfully treated with adalimumab. Since the coexistence of HS and AF has a devastating emotional effect on the patient, there is an urgent need to implement therapeutic approaches. © 2021 S. Karger AG, Basel. All rights reserved