Thank you for sharing your question with the EmpowHER community.
A&D ointment is used to treats and prevents diaper rash primarily. It also helps heal dry, chafed skin and protects and soothes minor cuts and burns. I would not recommend using it on your vagina. Since you are experiencing burning on top of dryness, it's important that you get a proper diagnosis and treatment. Here's some additional information on the topic: