2nd course of roaccutane in 2 years. Any suggestions?

I was on 20mg a day for 7 months then stopped. i had clear skin for about 6 months then my acne came back but not as bad as it originally was. I have now started roaccutane again and am 3 months in. because my courses are so close together does this mean the 1st course of 4200 mg will be added to my new course how ever long that may be. i am currently still taking 20 mg a day. and is this possibly why my acne came back so soon because i hadnt had the right about of dosage? looking for answers thanks

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