CD79A and acquired polycythemia vera: This diverse group includes pemphigus vulgaris (PV), pemphigus foliaceous (PF), paraneoplastic pemphigus, bullous pemphigoid (BP), cicatricial pemphigoid, dermatitis herpetiformis (DH), epidermolysis bullosa simplex, and linear immunoglobulin (Ig)A dermatosis, each presenting with distinct clinical and immunological features necessitating meticulous evaluation [4].