I have a rash that started behind my right ear maybe November not exactly sure! Did not know what it was thought I nicked myself shaving my head, I shave my head and face daily! I also use Just For Men for mustache and beard! I've had a rash from that in the past. I thought maybe shaving my face and head with the same razor transferred a rash from the hair dye ! Now January the rash has spread across the back on my hairline . After research it looks like plaque psoriasis maybe?