National Stretch Mark Day is observed worldwide every March 19, celebrating body positivity and self-acceptance by encouraging individuals to embrace their stretch marks. Established in 2019 by Anya Harris, the day aims to remind people that stretch marks, which can occur due to various factors such as pregnancy, puberty, and rapid weight changes, are nothing to be ashamed of. Stretch marks, also known as striae or tiger stripes, are scars formed from the tearing of the dermis and can appear on areas with significant subcutaneous fat. While some may seek to diminish their appearance, there is no cure for stretch marks, and the focus of the day is on acceptance rather than alteration. Participants are encouraged to share their experiences on social media using hashtags like #NationalStretchMarkDay and to post photos showcasing their stretch marks. Notable figures, including celebrities like Kourtney Kardashian and Lizzo, have contributed to changing perceptions about stretch marks by openly embracing them.