lip balm; lip cream; chapstick
Common everyday term for a moisturizing product applied to the lips. 'Chapstick' is a trademark but widely understood.
from English lip cream
冬はリップクリームが手放せない。
I can't go without lip balm in winter.
リップクリームを塗ってから口紅をつける。
I apply lip balm before putting on lipstick.