Dr. Selk interviews Dr. Jill Allbritton, a dermatologist and dermatopathologist at the University of Maryland, and an expert in vulvar diseases. In this episode they discuss high grade squamous intraepithelial lesions (HSIL) and differentiated vulvar intraepithelial neoplasia (dVIN). Topics covered include the definition of HSIL and dVIN, the symptoms and appearance of HSIL lesions, the presentation of dVIN and when to biopsy, diagnosis of HSIL and dVIN, the varying HSIL and dVIN treatments depending on the patient and lesion, recurrence rates, Bowen's versus HSIL on pathology, and patient follow up recommendations.