National Lips Appreciation Day is celebrated on March 16th and was created by Thomas and Ruth Roy of Wellcat Holidays to emphasize the importance of caring for and appreciating lips. This day encourages individuals to admire their lips, which play a significant role in personal expression and communication. Customs for celebrating include applying nourishing lip balm, trying new lip colors, and engaging in fun activities like sucking on lollipops or whistling. Participants are also encouraged to use the hashtag #NationalLipsAppreciationDay to share their appreciation on social media. The day highlights the uniqueness of lips, noting that they have the highest density of nerve endings and are susceptible to dryness and sun damage.