YOU SAID:

I have a blister on my foot

INTO JAPANESE

私は私の足に水疱があります

BACK INTO ENGLISH

I have a blister on my feet

INTO JAPANESE

足に水ぶくれがあります

BACK INTO ENGLISH

There is a blister on the foot

INTO JAPANESE

足に水ぶくれがあります

BACK INTO ENGLISH

There is a blister on the foot