The word 'zit' emerged in American slang during the mid-20th century, with its first recorded use around 1966. Its exact origin is obscure, but it is widely considered an invented term, possibly chosen for its sharp, abrupt sound which mimics the sudden and unwelcome appearance of a pimple. It may be influenced by similar-sounding slang words or simply be a product of arbitrary coinage that gained traction through its use in youth culture. The term successfully entered common informal vocabulary, becoming a standard, albeit casual, synonym for a pimple.

This is a simplex word. It is a slang term of unknown specific origin, likely formed by onomatopoeia or arbitrary coinage in American English.