genital area; private parts
A formal, clinical term for the external genital region. In everyday conversation, more colloquial expressions are often used.
医師は陰部の診察を行った。
The doctor examined the genital area.
I'm concerned about itching in the genital area.
陰部 is a plainer clinical term for the genitals, while 局所 is a more euphemistic way of referring to the same area.
perineal region
Standard kanji spelling for the anatomical term.
Compound of 陰 (いん, 'yin; hidden; private') and 部 (ぶ, 'part; region'), literally 'hidden/private part'. The exact historical derivation is uncertain, but the kanji combination is conventionally associated with the anatomical meaning.