Oh, I meant "comb my hair with my hand" as written by Phaedrus in Post #2.
Your hand doesn't make a very good comb. Buy a comb.
I comb my hair with my hand only as a last resort. It's like trying to rake leaves with a pitchfork.
The version with "fingers," which, though more specific, means the same thing, seems a bit more popular than the version with "hands." From Google:
"comb my hair with my hands": 7,210
"comb my hair with my fingers": 28,500
"combs his hair with his hands": 2,640
"combs his hair with his fingers": 7,130