Special Razor For Shaving Scalp?

Hi their, I have alopecia areata. I first noticed my hair loss on my 48th birthday, within weeks I had lost 99% of my head hair and my eyebrows.

That was six months ago and in that time my hair has regrowen twice or three times in patches of white fluff. (my hair was quite dark before)only to fall out again. What I would like to
know is their a razor or something special I can get that will help me to shave my head without cutting my scalp. I am sick of the little tuffs that regrow only to later fall out and have been shaving my head with a razor and shaving cream that nicks it at the back where I can’t see. Thanks

I don’t shave my head, so I can’t give any personal recommendation — but I have heard good things about the HeadBlade. It costs $15 at Drugstore.com, but you can probably find it locally (check the HeadBlade site for a list of stores).