I have it in the same areas.

I use dermarest(salysilic acid) shampoo when it's really crusty in my scalp. It dries the scalp out a little, which can make it itchier in the short term, but it clears the plaque. I use a Neutrogena ketoconazole shampoo for prevention. If it's really bad I shave my head and apply lotion directly to my scalp.

The rest I treat by keeping it well moisturized, especially applying immediately after showering. I used to have a prescription steroid cream, but I hate going to the doctor so I haven't had it in a few years.