I remember feeling like a crackhead always itching my face for that first month. The itchiness was also mostly on my face and arms too, I have no idea why accutane does this and why it happens only in the first month. It'll be gone in month 2 and you'll forget it about it by then
Everything that you mentioned got extremely itchy for my into my second week of accutane.
I now moisturize with CeraVe heavy cream that comes in a jar every morning and night. I use argan oil (many, many drops) on my scalp every night too.
I use Embryolisse cream on my face every morning and night.
I use a lot more moisturizer than I used to before starting accutane. I take big globs to spread on my body, face and scalp instead of just a a little bit.
Now that I am more into my 3rd week and I've been moisturizing a lot more, my skin has gotten much less itchy.