YOU SAID:

I have an itch in my armpit

INTO JAPANESE

脇の下にかゆみがあります

BACK INTO ENGLISH

I have an itch under my armpit

INTO JAPANESE

脇の下にかゆみがある

BACK INTO ENGLISH

itchy underarms

INTO JAPANESE

かゆい脇の下

BACK INTO ENGLISH

itchy armpits

INTO JAPANESE

かゆい脇の下

BACK INTO ENGLISH

itchy armpits