Seborrheic dermatis is usually confined to the oily areas of the nose/forhead/scalp...Your case seems to be more like Tinea Barbae
https://duckduckgo.com/?t=avast&q=tinea+barbae&ia=web
Try Selsun Blue shampoo-- Lather the affected area with it after your usual daily ablutions, then rinse it off, but not too well. It's an anti-fungal and you want some rsidue to remain on the skin & beard...If you have a beard (as opposd to clean shaven), it's hard to get creams & lotion in to where they're needed.
Another possibility, given the involvement in and behind you ears, is psoriasis-- or maybe a contact dermatitis from ear buds/wires/chin straps or laundry products on shirt collars/ties, or after shave, etc?
Have you seen a dermatologist, or a PCP who just stares at his computer screen?