Is there any way to prevent cyst like zits?

I'm 18 and I've been on 2 separate sessions of accutane, once for 8 months and another for 4 months, my acne is almost all gone except for these cyst like zits. I get them occasionally and I go in and get them injected, but they just are a huge annoyance. Recently I've gone in and gotten the same zit infected 3 times in the last month and a half, it goes down for a week but it keeps coming back. Is there anyway to prevent cyst like zits, or at least a way to get them to go away for good?

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