YOU SAID:

my hat has a birthmark

INTO JAPANESE

私の帽子にはあざがあります

BACK INTO ENGLISH

My hat has bruises

INTO JAPANESE

帽子に打撲傷があります

BACK INTO ENGLISH

I have a bruise on my hat

INTO JAPANESE

帽子に打撲傷があります

BACK INTO ENGLISH

I have a bruise on my hat