Does accutabe have to make skin worst at the start?

Patient: I had a question concerning accutane. I have been on isotretinoin for a full month now, and ive heard alot from people that it gets worst before it starts to get better. (Im currently on a 20MG dose once daily) I have noticed my lips drying up and my hair not getting greasy, as well at general face oil on my face especially around the nose that was a big problem my question is whether the blemishes HAVE to worsen before they get better?