キスマーク

noun

hickey; love bite

A bruise-like mark left on the skin by sucking or biting during kissing.

• 首くびにキスマークがついてるよ。

  You have a hickey on your neck.

noun

kiss mark; lipstick mark

A visible mark left by lipstick or the shape of lips after kissing, not a bruise.

• 鏡かがみを見みると、頬ほほに赤あかいキスマークが残のこっていた。

  When I looked in the mirror, there was a red lipstick mark left on my cheek.