as PR-like eruptions may have peripheral eosinophilia, interface dermatitis and eosinophils on histopathology, with no evidence of HHV-6 and HHV-7 systemic reactivation. 3 Our cases had overlapping features of both PR and PR-like eruptions.COVID-19 has been associated with cases of PR and PRlike eruptions following the acute infection. 6,7 Skin biopsies may demonstrate positivity for the SARS-CoV-2 virus spike protein on endothelial cells and lymphocytes suggesting a direct relationship between SARS-CoV-2 infection and PR. 7 SARS-CoV-2 may also trigger PR by reactivation of HHV-6 or HHV-7. 5 PR eruptions have developed following vaccination for influenza and H1N1 8-10 and may be secondary to reactivation of HHV-6 and HHV-7, which may be detected in skin biopsies via in situ hybridization and immunohistochemistry. 9 Another possible cause for PR in the setting of vaccination is a T-cell-mediated response triggered by molecular mimicry from a viral epitope. 8 Given worldwide vaccination efforts against COVID-19 with mRNA vaccines, it is important for doctors and patients to recognize possible adverse events including PR. Further study is required to confirm the causative link, including direct examination of tissue and serological studies for evidence of HHV-6 and HHV-7 reactivation.

Introduction: Few data on possible local factors that can influence the achievement of response in nonsegmental vitiligo (NSV) treated with narrowband ultraviolet B (Nb-UVB) phototherapy are available. Our objective is to evaluate possible correlations between therapeutic outcomes and dermoscopic and local (lesional) clinical findings of vitiligous lesions undergoing Nb-UVB phototherapy to find positive and/or negative response predictor factors to such treatment. Methods: For each target patch, we calculated the extension area using a computer-aided method and assessed dermoscopic and local (lesional) clinical findings at baseline. After 30 phototherapy sessions (twice weekly), surface area of the lesions was reevaluated to assess clinical improvement, correlating the therapeutic outcome with initial clinical and dermoscopic features. Results: A total of 70 lesions were finally included in the study. At the end of therapy, 18 patches (25.7%) achieved improvement, and the presence of perifollicular pigmentation on baseline dermoscopic examination was found to be associated with a 12-fold higher probability of having a positive therapeutic outcome. Similarly, face localization was also correlated with clinical amelioration, with a sevenfold higher probability for improvement. No association (p [ 0.05) between therapeutic outcomes (either good or poor) and other dermoscopic or local clinical variables (including leukotrichia) was observed. Conclusions: Therapeutic response of vitiligo to Nb-UVB phototherapy may be positively affected by local features of the lesions, i.e., face localization and presence of perifollicular pigmentation on baseline dermoscopic examination, which might be considered as positive response predictor factors to optimize treatment of vitiligo.

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Ulcus vulvae acutum is a rare clinical condition characterized by the presence of multiple acute painful genital ulcers of non-venereal origin associated with systemic symptoms in young women. The aetiopathogenesis of the disease is not fully understood, although recent reports have associated it with the Epstein–Barr virus. Diagnosis is difficult and generally made by exclusion after venereal diseases, and autoimmune, inflammatory, traumatic, and neoplastic causes. We describe a case of adolescent female with an episode of ulcus vulvae acutum associated with infectious mononucleosis. The diagnosis was supported by the clinical symptoms, elevated circulating levels of liver enzymes, positive EBV serology, cervical and inguinal lymphadenomegaly, and hepatosplenomegaly. The patient presented a history of aphthous stomatitis. Negative Pathergy test and the absence of any other related symptoms allowed us to exclude the Behçhet syndrome. Lesions healed with no sequelae or recurrences.

Borrelia burgdorferi is highly susceptible to antibiotic treatment and the majority of patients profit from this treatment. Antibiotic selection, dose and route of administration, and duration of therapy for Lyme disease depend on the patient's clinical manifestations and stage of disease, age, pregnancy status, as well as the presence of other concomitant diseases and/or allergies. Despite an appropriate antibiotic therapy, about 10-20% of patients may show persistent or recurrent symptoms ("post-treatment Lyme disease syndrome").In the present paper we will briefly discuss the post-exposure prophylaxis, before going on to talk over the current therapeutic approach regarding the management of Lyme disease according to the stage of disease/clinical manifestations. Finally, we will discuss the main treatment-related phenomenon, the Jarisch-Herxheimer reaction, and the treatment modalities for special categories of patients, namely pregnant women, subjects suffering from post-treatment Lyme disease syndrome, possible Borrelia-associated skin manifestations, coinfections and Baggio-Yoshinary syndrome.