If it includes a red & or raised area, it could be seborrhea (typical dandruff). Use a dandruff shampoo like Selsun Blue every other day for 2 weeks to see if there's a difference.
It it's tender, you're traumatizing that sensitive area. Try to stop going for BBS for a while, but don't stop shaving. Your scalp will become accustomed and you'll be able to go back to BBS later.
If it's just dry and flakey (not red, raised, or tender). Try Corn Husker's. (Yes, you can use it on your scalp.)
Remember, most moisturizers actually prevent water loss more than providing the moisture. They are best applied immediately after washing the area or even while it's still a little wet.
Also, over use of moisturizing can cause a paradoxical effect (your skin defends against the excessive oil and actually causes the opposite of the desired effect.)