我猜他应该是食物过敏。

Wǒ cāi tā yīnggāi shì shíwù guòmǐn.

I guess he probably has a food allergy.

我花生过敏。

Wǒ huāshēng guòmǐn.

I’m allergic to peanuts.

我皮肤过敏了。

Wǒ pífū guòmǐn le.

I’m having an allergic reaction on my skin.