I took my bp to the vet at the earliest sign of a respiratory infection. We discussed my husbandry. He suggested that I get a bigger heat mat and report back if it didn't clear up. It did clear up. No antibiotics needed. Vets are most effective during the early stages of a problem.
I had a parakeet with similar darkening around the nostrils. A vitamin shot cleared it up. So, when in doubt, take them to the vet.
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