3 sentences

1. 别挠我，我最怕痒痒了。

   bié náo wǒ, wǒ zuì pà yǎng​yang le.

   Don't tickle me; I'm very ticklish.

   Source: Dong Chinese Dictionary

2. 别挠我痒痒！

   bié náo wǒ yǎng​yang!

   Don't tickle me!

   Source: OpenSubtitles

3. 我的后背有点痒痒，请帮我抓一下。

   wǒ de hòu​bèi yǒu​diǎn yǎng​yang, qǐng bāng wǒ zhuā yī​xià.

   My back is a bit itchy; please scratch it for me.

   Source: Dong Chinese Dictionary