"I'm wondering whether warts can grow inside the body."
You ask a very interesting question. I had never considered before that warts would be internal. The only thing that I had known about them is that they grow long "roots" or tend to penetrate rather deeply. Initially when Apxr asked about them, I thought perhaps he found a "bug" that would indicate their presence. However, Apxr provided you with a micrograph showing you the bumpy things, which was rather interesting. For this reason, I would lean to "yes" to your answer. I think, you've proven in your posts how well things can stay hidden in the body when they are taken care of properly. Obviously, topical wart compounds do EXACTLY what they've been designed to do -- topical. A good internal fungal treatment may have helped with killing off the rest of the condition. Just my take on things.