THanks for writing in,
There are a few possibilities as to what could be going on with your boy. The first is if he has a skin infection. In this region it takes about a 4-6 week course of antibiotics to clear this up. I would also suggest you add fish oil to his diet, you can pick this or essential fatty acids up at your vets office. If this doesn't improve then I would suggest you have a nose biopsy done to rule out any immune mediated skin problems such as lupus. I hope this helps!
Dog Veterinarian
Veterinarian, Dog/Cat Veterinarian