What procedures can lighten vagina?

I went through pregnancy a year ago and since then my labia majora and entire inner vagina, butt crack, and anus have darkened and I would like to know if there are any procedures that give permanent skin lightening results such as skin resurfacing, I'm not sure how that would be done as I am sure resurfacing such a sensitive area would be painful. Please help me with any known procedures that provide permanent results that your clients have been happy with. THANK YOU!

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