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Sweet syndrome, also called acute febrile neutrophilic dermatosis, is a rare disorder characterized by skin lesions accompanied by high fever and elevated inflammatory markers.

During the COVID-19 pandemic, vitamin D was used along with vitamin C and zinc as a preventive and curative therapy against SARS-CoV-2 infection. Vitamin D toxicity, even if it is rare, occurs when serum concentrations exceed 150 ng/mL and is usually manifested by hypercalcemia phenomena.

Introduction: Schnitzler syndrome (SchS), first described in 1972, is a rare autoinflammatory condition characterized by chronic urticaria and monoclonal gammopathy of IgM or, exceptionally, IgG profile. Additional features include recurrent fever, evidence of abnormal bone remodeling, a neutrophilic dermal infiltrate on skin biopsy, leukocytosis or elevated C-reactive protein, according to the Strasbourg criteria.