also: いれほくろ
noun
fake beauty mark; drawn-on beauty spot
A cosmetic mark drawn or applied on the face or body to resemble a natural mole or beauty spot.
彼女は頬に入れぼくろを描いて、より魅力的に見せた。
She drew a fake beauty mark on her cheek to look more attractive.
noun
Slang or colloquial term for a tattoo, likening it to an artificial beauty mark. Often used in casual or underground contexts.
彼は腕に入れぼくろを入れた。
He got a tattoo on his arm.
Compound of 入れ (ire, 'putting in') + ぼくろ (bokuro, 'beauty mark'). The tattoo sense is a metaphorical extension.