How well does accutane deal with white heads? (photos)

I have very severe acne and have been taking accutane for over 9 months and have seen little to no improvement on my whiteheads. And my situation is also getting progressivly worse. my dermotolgist gives me cortisone injections from time to time but after a week or so the lumps start to come back. The cause of all of this was long exposure to long greasy hair and a terrible diet. please help. 

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