Accutane & Knee Pain?

Hello, I've recently started running three times a week (I was inactive prior to this except for walking to/from school etc). For the past week or so I've had discomfort in my right knee. It's not there all the time and when I actually work out (run) it disappears and is replaced by a "warm" feeling. Could this be a side effect of accutane (i.e. "joint pain") and if so do I need to consult a physician about it or is it harmless? I'm going to take a break from running for a couple of days.