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If you have used a lot of products and it's not helping, you might want to see your vet to rule out a thyroid condition. This is a common cause of nose problems.
I would start by washing the area well with peroxide or betadine. Then apply some neosporin ointment. If this does not help, you should see your vet for some additional tests.
After the healing starts, there is a great product called "bag balm" that is a moisturizer that you can get at wal-mart. It works great for noses.
Let me know if you still have questions.