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A 60-year-old post-menopausal female presented with vulvar itching for one year. She had noticed a whitish lesion on the vulva that slowly increased in size over the year. She had been unsuccessfully treated with oral fluconazole and topical clotrimazole-mometasone combinations and the plaque had gradually spread to involve the clitoris and peri-urethral area. She was neither diabetic nor hypertensive and had no other systemic complaints. Examination revealed a well-defined non-tender whitish plaque situated on her left labia minora and clitoris (Figure 1). A swab from the plaque did not grow any organism. Routine blood chemistry including a VDRL and HIV ELIZA were within normal limits. A punch biopsy from the lesion was taken and histopathology findings were as seen in (Figures 2 and 3).
What is the diagnosis?
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