An Unusual Variant of Lupus Erythematosus or Lichen Planus*

Four patients with a similar eruption of distinct livid plaques are presented. Clinically, the lesions were difficult to diagnose as either lichen planus or lupus erythematosus. However, histological studies with standard and immunofluorescence staining methods were more consistent with lichen planus. In contrast, certain laboratory findings and the clinical course were suggestive of lupus erythematosus.