Continuous flaky skin even after moisturising?

I am currently on 50mg of Accutane and I am continuously getting flaky skin. I moisturise all the time but about 10 minutes later, I have more flaky skin. What can I do to get rid of this; is there any recommended moisturisers ( using cetaphil moisturiser at the moment). Also, I have had eczema but it has gotten significantly worse on my arms and neck, is there anything to help this ( I have been using dermol cream a lot). Thanks