Because your donor hair has rejected you. Ryan Dear Ryan, When I stick my finger in my ear it comes out all waxy. Well you can kill yourself now or whack it off. Boner Dear Spot, Kill him. I'm just joking.
Castration is nothing to be ashamed about.
I hear Eunuchs are making a come back. Well this all depends on how you treat your hand afterwards. If you coddle and fuss over it, I'm sure it will happily perform again. The hand is a needy lil bitch. Not unless you jab a shard of glass in your eye.