ringworm; tinea corporis
A fungal skin infection causing a ring-shaped rash; commonly referred to as ringworm of the body. In everyday Japanese, the kana form たむし is standard.
I tend to get ringworm in the summer.
Antifungal medication is used to treat ringworm.
水虫 refers specifically to athlete's foot (tinea pedis), while たむし is ringworm on the body.
いんきんたむし is jock itch (tinea cruris), a type of ringworm in the groin area.
jock itch; ringworm of the groin; tinea cruris
Katakana spelling is sometimes used for emphasis or in medical labeling.
Rare kanji form; the characters literally mean 'rice field insect' but are used here for the skin condition.
Rare medical kanji form; not commonly used in everyday writing.
The origin is uncertain; the kanji 田虫 (rice field insect) may reflect a folk belief linking the condition to insects in wet fields, but this is speculative.