I don't know what country you live in, but most vets should know about budgies as part of their training. Your first port of call must be a vet, for an examination at first hand.
However, this web page may help you:
https://pets.thenest.com/mean-budgie...rty-10970.html
From that page: "Green-stained vents often mean poor quality feed and usually appear within 24 hours of eating new food. Providing healthier food should make symptoms disappear."
I repeat that you should take your budgie to a vet for a check-up, to be sure. Keep us posted!
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