Dry and Irritated Skin/Excema During and After Accutane. Any suggestions?

During my course of Acc I got the rash on my chin once every 2 weeks for a few days then disappeared. I showed my derm who advised me it was Eczema due to Acc. Once off Acc 3month got it twice. I am now using Epiduo on my skin 3 times a week and got it again on my chin. So I avoid the chin I use it on face.The rash which it is dry, sore itchy. I moisturize my skin everyday twice a day, the rest of the skin on my face is perfect apart from this rash. Why am I still getting this What should I do

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