Verdaguer-Faja, Júlia1,2; Valdivieso, Lorena2,3; Fabregat-Pratdepadua, Maria1,2; Melendo, Gustavo Tapia2,3; Quer, Ariadna2,3; Carrascosa, José M.1,2,4; Boada, Aram1,2,4
1From the Dermatology Department, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, España
2Departament de Medicina, Universitat Autònoma de Barcelona, Badalona, Barcelona, España
3Pathology Department, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, España
4Institut Investigació Germanst Trias i Pujol (IGTP), Badalona, Barcelona, España E-mail: [emailprotected]
This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 4.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sir,
The coronavirus disease 2019 (COVID-19) vaccination has been rapidly implemented worldwide. Local reactions, such as erythema, induration and pain at the injection site, are among the most common side effects, whereas delayed injection-site reactions have been rarely reported.[1]
A 51-year-old healthy woman presented with a 4-month history of an asymptomatic nodule on her left arm. The lesions had appeared in the same place where the second dose of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mRNA vaccine (Pfizer-BioNTech) had been injected a month earlier. Physical examination showed a 1 cm reddish elastic nodule [Figure 1a]. The dermoscopic evaluation revealed a lesion with pinkish background and unfocussed arborizing vessels [Figure 1b]. Surgical excision was performed. Histological examination demonstrated large nodular infiltrates of small size, non-atypical, lymphocytes with follicle formation, extending from the superficial to the deep dermis without epidermal involvement [Figure 2]. Immunohistochemistry revealed a mixture of B and T cells, highlighted by cluster of differentiate 20 (CD20) and CD3 stains [Figure 3]. Based on clinical and histological findings, the diagnosis of cutaneous pseudolymphoma (CPL) associated with the SARS-CoV-2 vaccine injection was established. Sixteen-month control revealed neither signs of recurrence nor the development of new lesions after successive doses of the vaccine.
CPL is a benign reactive lymphoid proliferation in the skin that clinically and histologically simulates cutaneous lymphoma. Its aetiopathogenesis seems attributable to an exaggerated local immunologic reaction to different stimuli, such as drugs, vaccines, tattoos, arthropod bites or infections.[2] Vaccination site-associated pseudolymphoma is a rare phenomenon, reported with some vaccines, such as hepatitis A, hepatitis B, quadrivalent human papillomavirus, influenza, meningoencephalitis and tetanus.[2,3] It has been suggested that these lesions may be a delayed hypersensitivity reaction to aluminium hydroxide, a vaccine adjuvant used to increase its efficacy and promote immunogenicity.[2,3] The possibility of developing a second pseudolymphoma after a new injection of the same vaccine has also been reported.[3]
Two long registry-based studies about cutaneous reactions after SARS-CoV-2 vaccination have been published, without reporting any CPL cases among them.[1] Another case of CPL associated with the SARS-CoV-2 mRNA vaccine has been described,[4] presenting with similar characteristics to our case. Interestingly, unlike previously published cases of pseudolymphomas associated with other vaccines, neither of the two cases showed granulomatous pattern or necrosis in the histological examination. A possible explanation to different histological appearances of these two cases is that they are not related to aluminium hydroxide as this vaccine does not contain it.[5] More recently, a case of CPL has been described appearing on the blue ink of a tattoo shortly following a COVID-19 vaccination, suggesting COVID-19 vaccination may also worsen or precipitate the development of cutaneous inflammatory disorders, such as in tattoos that were previously well-tolerated.[6] Other cases of primary cutaneous lymphoproliferative disorders (PCLDs) developed following COVID-19 vaccination have been reported in the literature and are summarized in Table 1.[1,4,7-12]
This article presents another case of CPL associated with the SARS-CoV-2 vaccine. Unlike previous cases of vaccine-associated pseudolymphomas, it presents with some subtle different histological features and no involvement of aluminium in the pathogenic mechanism. Although rare, clinicians should be aware of this phenomenon, as with the rapid generalization of SARS-CoV-2 vaccine worldwide, new cases of vaccine-associated CPL are expected.
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
Acknowledgments
The authors sincerely thank the patient for her willingness to the publication of this case report.
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