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Unfortunately, even if terrified, we can't allow that to be the reason for much needed veterinary care to be delayed any further.
That growth is very likely already secondarily infected, and this problem is going to get exponentially worse.
A vet visit is really necessary. Cody may need to go on some antibiotics, and perhaps, they can do some alternative topical therapies. But, without that vet visit, we don't know what options are available.
I wish I could do more.
You can apply neosporin to the area. If a bit inflamed, you can also use some topical hydrocortisone.
Protect it! Wrap it. Whatever you can do to prevent any further self-trauma to the area.