Isolated lichen planus of lip: Dx and Mx using dermoscopy
The present case has been reported in the journal Clinical Case Reports.

A 44‐year‐old male presented with a four‐month history of a raised and scaly plaque over the medial aspect of lower lip followed by the appearance of two similar lesions over the right lateral aspect of the same lip.

Examination of skin, nails, and buccal mucosa revealed no abnormalities. Polarized light dermoscopy over the lateral lesion showed Wickham striae (WS) in a linear pattern and medial lesion showed prominent WS in a circular pattern. Diffuse scaling and violaceous background were seen in dermoscopy of both lesions.

A punch biopsy was performed from the lateral lesion and the histology revealed hyperkeratosis, basal vacuolar degeneration, and prominent band‐like lymphocytic infiltrate. Direct immunofluorescence test was negative for IgG, IgM, IgA, or C3 at the basement membrane zone.

These features favored the diagnosis of LP, and the patient was prescribed topical betamethasone dipropionate 0.5 percent ointment. The medial lesion was re‐evaluated by dermoscopy on the 14th day which revealed a significant reduction in the amount and thickness of the WS and scaling was almost absent. The same treatment was continued because a good response to treatment was noted.

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