Common loanword for lipstick, used in everyday contexts.
彼女は新しいリップスティックを買った。
She bought a new lipstick.
リップスティック is a loanword often used in fashion or product branding, while 口紅 is the standard, everyday Japanese term for lipstick.
リップスティック is an English loanword emphasizing the stick-shaped applicator itself, while ルージュ is the French loanword focusing on the lip color/product in general.
Borrowed from English 'lipstick'.