to have an uncomfortable feeling on your skin that makes you want to scratch; to make your skin feel like this （使）发痒
I itch all over.
我浑身痒。
Does the rash itch?
皮疹痒吗？
This sweater really itches.
这件毛衣真刺痒。
itch: [sing.] ~ (to do sth)(informal) a strong desire to do sth 渴望；热望
She has an itch to travel.
她渴望旅行。
the creative itch
创作欲