noun
birthmark; nevus
A mark on the skin present from birth or appearing shortly after; includes moles and other pigmented spots.
彼の左腕には大きなあざがある。
He has a large birthmark on his left arm.
noun
A discoloration of the skin caused by impact or injury; common in everyday speech.
転んで膝にあざができた。
I fell and got a bruise on my knee.