Why does Accutane cause back pain?

I have taken a few courses of Accutane in the past and each course lasts for about 4 months. It has been more than a year since I took any Accutane but I still get back pain every now and then and I think it is because of the Accutane that I have taken in the past. I was told that the side effects especially back pain caused by Accutane are completely reversible once the patient stops taking the medicine. I want to know what causes back pain while taking Accutane so that I can try and fix it.

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