Érythème noueux compliquant une maladie des griffes du chat : une association et des implications thérapeutiques à connaître

IntroductionCat-scratch disease is a zoonosis caused by Bartonella henselae and transmitted mostly through a break in the skin. This infectious disease is commonly characterized by a benign lymphadenitis. However, more unusual presentations have been observed.Case reportWe report the case of a 44-year-old woman with cat-scratch disease who developed subsequently an erythema nodosum. The non-steroidal anti-inflammatory treatment of the erythema nodosum may have led to worsening of cat-scratch disease with an abscess requiring surgical treatment.ConclusionCat-scratch disease is an uncommon and poorly known cause of erythema nodosum, and must be systematically ruled out. As non-steroidal anti-inflammatory drug are usually prescribed as a treatment of erythema nodosum, it should be used cautiously to reduce the risk of complications in the cat-scratch disease.     

Erythema ab igne with features resembling keratosis lichenoides chronica

Erythema ab igne (EAI) is an asymptomatic dermatosis that develops in response to chronic exposure to low‐grade heat. Characteristic findings on histopathology include epidermal atrophy, dermal elastosis, atypical histiocytes, and melanin and hemosiderin deposition. Reactive endothelial changes and prominent vascular proliferation are variable. Keratosis lichenoides chronica (KLC) is a rare lichenoid hyperkeratotic dermatosis. Acanthosis with parakeratosis and a lichenoid interface dermatitis with lymphocytes, histiocytes, and plasma cells are characteristic findings of KLC. Although its etiology remains unclear, KLC has been reported to occur in response to heat. Herein, we report a case of EAI with features resembling KLC.     

Immunoreactive cutaneous sporotrichosis

Sporothrix spp. infection can occur through the inoculation of the organism in the skin through direct contact with the soil (sapronotic infection), through contact with animals, such as infected cats and dogs (zoonotic infection), or less frequently via inhalation. With a subacute or chronic evolution, approximately 80% of patients affected by the disease present with the lymphocutaneous form; episodes associated with a hypersensitivity reaction are rare. The authors report the case of a 12-year-old child with immunoreactive sporotrichosis manifested clinically as erythema nodosum lesions in the lower limbs, associated with an ulcerated lesion in the left arm.     

Three cases of COVID-19 patients presenting with erythema

Individuals infected with the novel coronavirus (Severe Acute Respiratory Syndrome Coronavirus 2 [SARS-CoV-2]) who develop coronavirus disease 2019 (COVID-19) experience many symptoms; however, cutaneous manifestations are relatively rare. The authors encountered three patients with COVID-19 who presented with erythema and suspected viral rash. In all cases, erythema appeared after the onset of the initial symptoms of COVID-19. Erythema was considered to be caused by COVID-19 and not a drug-induced eruption because, in all cases, erythema was relieved merely by external medicine and oral antihistamines, without discontinuing the original medication. The authors’ hospital accepted 69 COVID-19 patients between 22 February 2020 and 31 May 2020 and, of these, three (4.3%) exhibited eruptions, and all cases presented erythema. Except for seven patients who exhibited positive nasopharyngeal swab tests for SARS-CoV-2 RNA but no symptoms, three (4.8%) of the remaining 62 patients exhibited erythema. Although various types of eruptions have been reported in patients with COVID-19, erythema was the only type in our patients. Erythema in the three patients exhibited many similarities to that previously reported in COVID-19 patients, particularly in the manner it appeared and disappeared. For these reasons, these three cases were considered typical examples of erythema in patients with COVID-19. Considering previous studies and the three cases reported here, there is a high probability that SARS-CoV-2 can cause erythema.     

与结核相关的脂膜炎研究进展

【摘要】 脂膜炎病因繁多而复杂，感染为重要病因之一，在欧美等结核低发区，以链球菌感染最为常见，但在结核高发地区如我国，结核杆菌感染是脂膜炎的重要因素，以Bazin硬红斑和结节性红斑最为常见。Bazin硬红斑与结核关系最为密切，常表现为下肢屈侧结节、斑块，可出现溃疡，病理表现为小叶性脂膜炎。结节性红斑可作为结核的早期症状出现，可作为结核的预测指标，常表现为双下肢伸侧红斑、结节，极少破溃，间隔性脂膜炎是其病理特征。Bazin硬红斑和结节性红斑的抗结核治疗常可取得理想效果。因此，明确结核分支杆菌与脂膜炎的关系，在脂膜炎的治疗及预后方面，尤其在结核高发地区有着重要意义。     

肉毒毒素治疗难治性玫瑰痤疮研究进展

本文总结了难治性玫瑰痤疮的临床表现及治疗难点,分析了肉毒毒素对人体的相关作用机制,并将肉毒毒素与难治性玫瑰痤疮的治疗机制相结合,总结两者之间的联系,综述了肉毒毒素治疗难治性玫瑰痤疮的相关研究进展,就近年来肉毒毒素治疗玫瑰痤疮的方法、疗效及安全性进行评估,希望对提高难治性玫瑰痤疮的疗效提供参考和帮助。     

Erythema induratum of Bazin in a 10‐year‐old boy

Erythema induratum of Bazin (EIB) is a form of tuberculid resulting from hypersensitivity to tuberculosis antigen. EIB occurs most commonly in middle‐aged women and is not typically seen in children. Here, we present a rare case of EIB, presenting as a chronic nodular panniculitis, in a 10‐year‐old Korean boy.