YOU SAID:

My backside is really scratchy

INTO JAPANESE

私の裏側は本当にチクチクしています

BACK INTO ENGLISH

My back is really tingling

INTO JAPANESE

背中が本当にチクチクする

BACK INTO ENGLISH

The back is really tingling

INTO JAPANESE

背中は本当にチクチクしています

BACK INTO ENGLISH

The back is really tingling