Does your scalp turn black and peel? My son has had this problem for a couple of years now, and is gradually spreading.
Jonathan:
Actual pustules on the scalp generally are not seborrheic dermatitis. They are either infectious (staph) and require antibiotics, or else they are strss-related, perhaps from picking and squeezing. They aren't usually hereditary, in my experience. I'd see a dermatologist for culture and definitive diagnosis.
Best.
Dr. R