A 6-day-old male with history of waxing and waning urticarial rash presents to the general pediatrician’s office for evaluation. The parents describe the rash as red, raised skin lesions that become ...

People with vasculitis may need at least three or four vaccinations for COVID-19 before they start to show an immune response against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2 ...

Urticarial vasculitis represents 5% to 10% of cases of chronic urticaria, characterized histologically by the presence of vasculitis on skin biopsy. Clinically it tends to last longer than ...