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Hello. Thanks for writing in. My name is***** and I would be happy to help you. If the mass has a long stalk attached, chances are that it is benign, but there is no way to be 100% sure by looking at it. If he was to develop a cancerous tumor at his age, it would probably be a mast cell tumor. Given that is seems to be causing him some problems already, I would just consider getting it removed. Your vet can send it in for a biopsy to make sure it is not cancerous. If you have a picture you can post to your next message, I would be happy to look at it. Please let me know if you have any other questions or concerns. Hope this helps.
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Thanks for the pictures. Like I said, you cannot be 100% sure by just looking at it, but those masses are typically benign. The problem here, though, is that mass may stay chronically inflamed now, especially if some of the tissue gets necrotic after being burned. With her young age, I would just remove it because it will probably get bigger and may cause more problems. Let me know if you have further concerns.