It would help if it wasn't blurry in the photos. Is there any lump or is it flat? Is her cloaca actually open? (very hard to tell in blurry photos, & the skin "inside" is going to be light like this.) White on a black boa is very noticeable & you said it's always been there, so I'm thinking it's most likely normal-
I've never had a black boa, but I used to have some MBKs (Mexican Black King snakes) & they had some minor imperfections as far as coloration (not on their cloaca but on their ventral side)- I'm guessing that's all this is on your snake. If there's any symptoms connected with this though (swelling, bleeding, abnormal behavior, bad odor, etc.) then ask your vet. (Do you have contact with the source-breeder of this snake? Ask them- it could easily be a genetic thing.)
That's a drop-dead beautiful snake, by the way.
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