That might be favus. You could try to wash them off with soap and water, and rub a bit. Miconazole or clotrimazole anti-fungal cream can be put on the comb as well.
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Just about all her breast back and tail feathers are gone and growing in new. The new feathers look healthy. I'm looking at my pictures and feeling things about the crusty on her right nostril. I looked down her mouth again and I don't see anything abnormal. She starts open mouth breathing when I hold her and I can't tell if it's from stress and discomfort or something else.