Accutane / Acnotin stages?

I'm currently on prescription on Acnotin 10, one tablet a day for 17 days now. Experiencing really dry lips and skin around my mouth and eyelids are cracking really badly. Also, new pimples (about 10 or so) popped out. Is this the purging period? if so how long will it last? and is the purging period a one time thing or will it happen again (cyclical)?

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