Long term accutane use and still my acne is not resolved?

Hi, I ve been prescribed roaccutane first time by Doctor, went through the full 6 m course and was clear but after 2-3 months acne returned. Since then for about 6-7 years I keep taking roaccutane in small doses, abput 10-20 mg all the time. I tried to stop few times but soon after acne returns. I would like to stop it because I would like to try to conceive but now after being just 1 week off roaccutane I start getting acne back and my skin is extremely oily. How can I get the long lasting results?

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