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Distinction histopathologic between Mucha-Habermann disease and secondary syphilis may be difficult because the two diseases have so many attributes in common. Both may be associated with a superficial and deep perivascular and lichenoid infiltrate of mononuclear cells, acanthosis, parakeratosis, and erosion or ulceration. Erythrocytes are extravasated in the dermis, neutrophils and lymphocytes may be seen […]