Severe herpes simplex virus - 1 Kaposi varicelliform eruption and SARS-CoV-2 infection in atopic dermatitis treated with dupilumab.

Herpes Simplex Virus-1 (HSV-1) Kaposi varicelliform eruption (KVE) is a rare and severe cutaneous manifestation, clinically characterized by the presence of widespread vesicles and pustules. A case report details a patient with a history of Atopic Dermatitis (AD) and recent SARS-CoV-2 infection who developed a severe KVE subsequent to the viral illness. The patient, a 35-year-old male, presented with severe atopic dermatitis (AD) subsequent to a SARS-CoV-2 infection. In a period of four months, the dermatological eruption underwent a rapid progression to a severe state, characterised by the presence of extensive vesicles and pustules, in addition to the emergence of symptoms. In conjunction with a chest CT scan, plasma and antigen testing, the patient was confirmed to be positive for HSV-1 positive. The patient exhibited elevated levels of IgE and a notable reduction in the absolute number of immune cells. The patient was treated with valaciclovir, piperacillin-tazobactam, IVIG at the same time. Within seven days of treatment, the blisters had dried up and the scabs had fallen off without any pain, pruritus, or fever. This case highlights the potential for severe viral eruptions, such as KVE in individuals with underlying dermatological conditions following viral infections.