With your Accutane course, you may not have been on it long enough, The purpose of a course of Accutane is to get the proper mg of the medication into your system to combat the type and severity of your acne, taking into account your weight. If you don't get enough of the medication, acne can and will come back, though usually a lot less. If it's not as bad as before, often another course isn't needed, but another type of medication, oral or topical, can be used just for random breakouts. If the breakouts continue or worsen, a second round of Accutane may be needed. Your skin may be purging as well.

Have you thought about going back to your gp/doctor or your derm?

Regarding Isotretinoin (Accutane), relapses this bad usually present much sooner than 2 years post treatment. Also I would be almost certain that your Dermatologist would have been quite diligent in giving you the correct dose. Even if they are cautious and give you a lower dose, they usually extend the overall treatment period to ensure that you've received a certain amount over the whole course. Did you actually complete the course or terminate early? I know it's horrible stuff to be on. I've personally had 3 courses.

You said you haven't been doing anything differently, how about your diet, hydration and exercise? Very big players in maintaining clear skin. Are you currently taking any other medications or have you recently ceased any? What about stress/sleep? Any changes?

Regards,
Nathan