Herpes zoster and COVID-19 infection: a coincidence or a causal relationship?

The first cases of COVID-19 were reported in Wuhan, China, in December 2019. Skin manifestations of COVID-19 vary, among which herpes zoster has recently been found to be associated with the infection. We studied the available literature regarding COVID-19-associated herpes zoster (HZ). We searched the PubMed and Scopus databases for available literature till 20th of May 2021 using the following terms: 'Herpes zoster' or 'Varicella zoster virus' and "COVID-19" or "coronavirus disease" or "SARS-CoV-2". This search revealed 87 publications, of which 29 articles met the inclusion criteria. A total of 29 patients had HZ associated with COVID-19 infection. The patients' ages ranged from 7 to 82 years, averaging 56 years. Thirteen patients (45%) were men and 16 (55%) women. We summarized the demographic data, clinical data, comorbidities, treatment used, lymphocyte count, and distribution and timeline of HZ rash in COVID patients. Lymphopenia was prevalent in 86.6% of patients (where lymphocyte data were available). We discuss possible causes of HZ due to COVID-19. More and larger studies are needed to confirm any relationship between these two infections; however, this study may pave the way for similar studies on this topic.

Urticaria and COVID-19: A review.

The first cases of the coronavirus disease (COVID-19) appeared in Wuhan, China, in December 2019. COVID-19 was declared a pandemic in March 2020. Cutaneous manifestations are among the heterogenous clinical features of the disease, and urticaria is one of the most common skin manifestations reported in COVID-19. We reviewed the literature available regarding COVID-19-associated urticaria. A literature search in the PubMed and Scopus databases was conducted, till the cut-off date of 24th July 2020, using the following terms: "skin" or "cutaneous" or "urticaria" or "urticarial," and "COVID-19" or coronavirus disease. The search resulted in 502 publications. In this review, 30 articles with a total of 202 patients with COVID-19-associated urticaria were included. Patient age ranged from 2 months to 84 years. Gender was reported in 149 patients; of these 96 (64%) were females, and 53 (36%) were males. Of the 105 patients with a determined onset of the disease, 58 (55%) presented with rash preceding or concurrently with the classic COVID-19 symptoms. Urticarial rash was mainly either generalized or distributed on the trunk. Associated respiratory symptoms, level of care, medications used, comorbidities, and duration, and distribution and timeline of urticarial rash were summarized. In this article, we present a review of literature on COVID-19-associated urticaria, which would enable dermatologists and other clinicians to diagnose COVID-19 early in the onset of disease, and prevent viral spread. Additionally, this may also pave the way for further studies on this topic.