A 58-year-old woman presented with typical cutaneous features of liche
n planus (LP). She had suffered from vulval pruritus for 3 years, and
examination showed lesions suggestive of LP on the vulva. Three months
later a plaque developed on the clitoral hood, and biopsy showed an i
nvasive squamous carcinoma. After vulvectomy, features of LP were foun
d in the excised specimen. Vulval LP should be carefully monitored for
possible malignant transformation.