Seems to be better now, I'm thinking it was an allergy to something, can't tell you what though, maybe a shampoo.. Try cutting things you use/eat one at a time & see how you go.
Did you ever figure out why? I have the exact same thing.
I am a woman in my mid thirties, and I've had it for a few years.
The dermatologist has no idea what it is, I think it might be relating to my sinuses, or maybe an allergy??
My GP, and even the Chinese Medicine doctor also have no explanation.
I've tried every possible cream, and an anti-inflammatory diet with no luck.