YOU SAID:

my face has a scar on it

INTO JAPANESE

私の顔には傷跡がある

BACK INTO ENGLISH

There's a scar on my face.

INTO JAPANESE

顔に傷跡がある。

BACK INTO ENGLISH

I have a scar on my face.

INTO JAPANESE

私は顔に傷跡があります。

BACK INTO ENGLISH

I have scars on my face.

INTO JAPANESE

私は顔に傷跡があります。

BACK INTO ENGLISH

I have scars on my face.