Why is my face still oily after being on acutane for a little over 2 months now.

I have been taking 70 mg a day for a month and I wash my face once a day and I rarely ever use a cleanser. I use a couple different moisturizers and none of them seem to help my oily skin. My face isn't very dry and I don't have many pimples on my face as the acutane has helped a lot with the pimples. It just hasn't seen to do much about the oily skin.

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