[Cody]

Yes, you need to have him seen by a vet that has experience with birds to determine if there in an infection in the GI tract that needs treatment with some type of medicine.

Locating an Avian Vet//On-Line Avian Veterinarian Help

Locate an Avian Vet Association of Avian Veterinarians Avian Association of Veterinarians Avian Vets have special training to determine the cause of symptoms resulting from illness or trauma. When you rely on unskilled individuals, you delay effective treatment. This can prolong suffering...

www.talkbudgies.com

 

[Cody]

I surely would not go to either of those vets, it is not normal for the vent area to be stained and missing feathers, there are various reasons that could cause it but it is not normal.