noun
scar on the forehead; frontal wound
Refers specifically to a scar or wound on the front of the head, typically the forehead. The term is somewhat specialized and not an everyday word.
彼は子供の頃に転んで、向こう傷が残った。
He fell as a child and was left with a scar on his forehead.
その侍は戦いで受けた向こう傷を誇りにしていた。
The samurai took pride in the frontal wound he received in battle.
Compound of 向こう (mukō, 'the front' or 'opposite side') and 傷 (kizu, 'wound' or 'scar'), literally meaning a wound on the front side, i.e., the forehead.