Didn't finish my Accutane treatment. I've been off it since July. What should I do? (Photo)

I started taking acctane on 10/1/2015 and been on it on and off..sometimes i forget to take the pill,,short story it took me six moths to finish only four months from the treatment then came summer and had too much to do and getting sun exposured often i fad to cutt it and now its been like four months and my acne has started to come back but not as much as it was before..although its always red and sensitive,,i dont know what to do..should i resume taking it again or start all over again?

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