Letter: Isolated annular lichen planus of lower lip.

Lichen planus (LP), the prototype of lichenoid dermatoses, is an idiopathic inflammatory disease of the skin and mucous membranes, hair follicles, and nails. It rarely occurs on the lips and usually then in association with oral lesions. We report a 40-year-old man with a 3-month history of an isolated single annular violaceous plaque of the lower lip. The rest of his mucosae, skin, hair and nails were normal. Histopathology confirmed the diagnosis of LP. The patient was advised to use topical tacrolimus 0.03 percent cream twice daily along with multivitamins, but the patient was lost to follow-up. Isolated LP of the lip is unusual, although this condition may be underestimated and therefore under-reported in the literature.