Red patches back of head on scalp

I have red patches on the back of my head on my scalp, not sure what it is as I haven’t gone to get it diagnosed.

Was wondering if I could get info from anyone here first. 

I don’t feel any itchiness from it or pain when slept on, it’s not patchy either. It’s just red patches, I generally I have dry skin typically behind my ear and in. Anyone have a similar issue?