Cyst Acne got worse and not leaving while on Accutane. Any suggestions?

This is my second cycle on accutane, i did 6 months the first time since i had gotten really bad acne in my chest, back and some on my face . By the end of the first cycle my face and back cleared up only the red marks stayed. My chest was clearing up but it seemed the acne came back but in the form of small cyst in my chest and it does not seem to get better. On 2nd cyle of the medicine and chest cyst seem to keep getting worse, dr has me on 20mg he prefers for 6-7 months. Any suggestions?

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