A unique case of IgG4-related skin disease and sclerosing cholangitis in a patient with previous hepatitis exposure

Immunoglobulin (IgG) 4-related disease (IgG4-RD) is an immune-mediated disorder of an unknown etiology characterized by the tissue infiltration of IgG4+ plasma cells into affected organs.1,2 Thus far, IgG4-RD has largely been reported in the context of middle-aged Asian populations.3 Although IgG4-RD typically causes multiorgan involvement, IgG4-related skin disease is uncommon, occurring in only 4.2%-6.3% of cases. Among the cases of...