背癢。

My back itches.

My back is itchy.

Source: Tatoeba

Sentence Composition

=1 背 bēi variant of 背 bēi
=1 背 bēi
  1. to be burdened
  2. to carry on the back or shoulder
=1 背 bèi
  1. the back of a body or object
  2. to turn one's back
  3. to hide something from
  4. to learn by heart
  5. to recite from memory
  6. (slang) unlucky
  7. hard of hearing
2 癢 yǎng
  1. to itch
  2. to tickle