Hey I know I've only been posting about my frantic health scares since I've joined this forum. I apologise, but Im a new bird owner and anything I notice is new to me! I've had my budgie for almost two weeks now and only today did I notice this crusty bubbly thing on his foot. I attached photos below. I will be taking him to the vet very soon, but I just wanted to know how serious this is, what could be the cause?
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