The lip in lupus erythematosus.

Lupus erythematosus (LE) frequently compromises the skin, lips and oral mucosa. There is a large body of medical and dental literature about the cutaneous and mucosal lesions of LE, but very little has been written specifically about labial lupus. The lip has a peculiar anatomical and histological architecture, and LE lesions at this site may have some distinct features. This article reviews the existing data and adds some new concepts to the issue of labial lupus in all of its presentations, comparing such lesions to the well-established characterization of cutaneous LE (in acute, subacute and chronic lesions), and highlighting some special clinical features that may enable a better diagnosis and differential diagnosis of lip diseases.