Hey Mikey, welcome.
Like Marz, I sufferred from Seb Dermatitis (completely sucks). However, I've gotten complete relief from it as a result of shaving the dome with a razor. Buuckkweet also brings up a good point, gotta moisturize. Also, make sure you use the right shave cream or oil to maximize protection during the shave process.
There's a ton of input on the SBG forum to help you along. Also, the guys here are very helpful with their input.
For me, I use a Headblade Classic Razor and have gotten great results with HeadSlick and also Shaving Gels (both Gillette and Edge). Recently picked up some Bald Guyz Shave Gel (gonna give that a try too).
For moisturizer, I use L'Oreal Comfort Max SPF15 Balm when I'm out in the sun (plus sunscreen). If I'm not, I'll use Banana Boat Aloe Vera After Sun Cream.
Good Luck.
Schro