Sir, There is significant uncertainty surrounding vaccines against COVID-19. Due to the critical need, these vaccines are being developed and approved at a uniquely fast pace [1]. Currently, the approved vaccines take their action by administering the host with sequences encoding the viral spike protein. This essentially means that these gene-therapy-based vaccines, whose long-term effects remain unknown, are going to be administered globally [2]. Therefore, despite their safety and efficacy demonstrated in respective clinical trials, it is reasonable to be cautious and adopt more intensive post-marketing vigilance [3]. A forty-nine-year-old diabetic male presented with asymptomatic, rapidly growing, leukodermal patches on the scalp (Fig. 1), which began to appear suddenly fourteen days following the administration of the first dose of the Oxford–AstraZeneca (AZD1222) vaccine against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The patches were clinically consistent with vitiligo and were confirmed with their well-defined, ivory-white patches by Wood’s lamp examination (Fig. 2).There were no leucodermic patches anywhere else on the body, no family history of vitiligo, and no history of COVID-19 viral infection. After one week of reevaluation, the patch increased in size. The patient also presented with cellulitis on the right groin persistent for three days and was treated with an antibiotic with a follow-up. All baseline investigations, including a full blood count and renal and liver function tests, were normal. The patient is currently on follow-up. Cytokines play a role in regulating the immune response and the depigmentation process in vitiligo. There is an imbalance in cytokine levels in patients with vitiligo. IFN-g expression plays a role in the autoimmune process in vitiligo. The expression of the cytokine IFN-g is associated with melanocyte destruction in the active phase of vitiligo lesions [4]. IFN-g interacts with the viral receptor, resulting in the consequent reduction of several virus replicating, down-regulating genes and gene products [5]. Li et al. [6] demonstrated that IFNs are potential drug choices for SARS-CoV-2 infection. Here, we hypothesize that patients with non-segmental vitiligo (NSV), an autoimmune skin (and mucosal) disorder, may clear SARS-CoV-2 infection more efficiently and have a lower risk of COVID-19 development. Conversely, in the case of COVID-19 development, vitiligo autoimmunity may influence the cytokine storm-related disease burden. In addition, immune activation during SARS-CoV-2 infection or COVID-19 disease may increase vitiligo disease activity. Our hypothesis is based on the shift of the immune system in NSV toward adaptive type 1 (IFNg and CD8 T cells) and innate immune responses [7]. It is unclear whether the vitiligo in our patient was caused by vaccination, However, the temporal relationship between the vaccine and the development of the disease is interesting. We may, therefore, conclude that our patient had his latent vitiligo activated by the vaccine. Yet, further work is needed to demonstrate a causal relationship between vitiligo and COVID-19 vaccination. To the best of our knowledge, this is the first reported case of vitiligo associated with the administration of the Oxford–AstraZeneca (AZD1222) vaccine.
