Translation guide
A common fungal infection of the feet. In Japanese, the standard term is 水虫 (mizumushi), literally 'water bug', but this is the everyday word for the condition. There are also more clinical terms.
I have athlete's foot.
The common skin condition between the toes or on the soles.
The most common and natural word for athlete's foot in everyday conversation. Despite literally meaning 'water bug', it is the standard term.
Medical/clinical term for athlete's foot. Used by doctors or on medication packaging.
Antifungal medication is used to treat tinea pedis.
Do not translate 'athlete's foot' literally as 運動選手の足 (undō senshu no ashi). That would mean 'an athlete's foot' (body part) and would not be understood as the medical condition.