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Agree with VIN 2-3.
You can do mucin stain to exclude extramammary Paget's disease, and do melanoma markers to exclude melanoma in-situ.
VIN is a little different from CIN: VIN occurs in skin, could be caused by HPV infection and non-HPV infection (for example p53 mutation), CIN is caused by HPV. Especially in older women, there is a type of high grade VIN (differentiated VIN) is not caused by HPV.