Effects of Accutane on Circumcision?

There have been case reports of Accutane causing excessive and complicated scarring with various procedures. It is safest to stop Accutane 6 months prior to ANY elective surgical procedure, including circumcision.
Hopefully you would not have problems, but I would recommend that you reschedule the elective circumcision for 6 months after you stop accutane. It's the safe and cautious thing to do.

It is generally recommended that elective surgical procedures that would damage the skin, such as excisional surgery or laser resurfacing, be delayed at least 6 months after Accutane, and many experts suggest waiting 1 year. The concern relates to poor wound healing and scarring has occurred in isolated incidents in some patients.
Of interest, a recent study published this month in Dermatologic Surgery demonstrated no increased risk of scarring in 7 patients with dermabrasion who were on Isotretinoin (Accutane). So there is still debate about this risk-- but I would be safe rather than sorry, and wait 6months.