I also apologize. Like mummummum said we get people here that like to "stir the pot" so to speak. I also googled the term you used and found nothing so presumed you were joking.
I have heard of something referred to as "plastic dish nasal dermatitis". I'm not sure if it causes sores but it does cause loss of pigmentation and the nasal skin becomes irritated and inflamed. The condition can be corrected by switching to a glass or stainless steel dish.
If you have already switched to stainless steel or glass and have seen no improvement then I would take your dog to the vet. Good luck and please post with an update.