Thanks for approaching justanswer with your concern.
This is a common problem for people with nasal allergy, caused by pressure in the area leading to sebum accumulation beneath, which gets darkened on exposure to the atmospheric oxygen.
Here is what you should do:
Continue for 3-4 months. If irritation occurs with Retin A, you can stop it for a few days, then restart again.Most people get good results, but take care not to bend the nose frequently .
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My answer is for your personal information only. It should not be used as a substitute to visiting your doctor. No treatment should be tried without first consulting a doctor