Accutane and nose acne, is this normal?

my nose is so oily unlike the rest of my face and it has acne which is not responding to topical treatments the doctor told me that i have to take isotretonin but the acne on my nose increasing even i'm at my fourth month on accutane it gets worse on exposure to sun ... it's color changes .. i afraid of developing scars on my nose which is visible and affects nose size

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