PMC5726665_01
Numerous erosions and blisters on the back
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Numerous erosions and blisters were observed on the trunk skin, with a mosaic-like distribution, and the Nikolsky sign was negative (Figure 1).
Deposits of IgG, IgA, and C3 autoantibodies on the dermal side of the
dermo-epidermal separation (X200)
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IgG, IgA, and C3 at the dermo-epidermal junction. Indirect immunofluorescence (IIF) studies on salt-split skin demonstrated deposits of IgG, IgA. and C3 autoantibodies on the dermal side of the dermo-epidermal separation, pemphigoid circulating antibodies were negative (Figure 2).