New-Onset Bullous Pemphigoid in a COVID-19 Patient

Table 1

Patient lab results.

Diagnostic	Location/type	Result	Normal value
Biopsy	Left flexor wrist	Epidermal keratinocyte necrosis, subepidermal vesiculation with eosinophils, gossamer stranding of the papillary dermis, subepidermal edema	<20 RU/mL (negative)
Direct immunofluorescence	Left flexor wrist	Strong linear IgG staining at the dermoepidermal junction, with weaker and focal linear C3 staining	≥20 RU/mL (positive)
Antigen-specific serologic testing	Bullous pemphigoid 180 IgG Abs	211.4 RU/mL	<20 RU/mL (negative)
	Bullous pemphigoid 230 IgG Abs	<1.0 RU/mL	≥20 RU/mL (positive)