Rug burn from sliding down stairs | It was totally worth it!… | Flickr
Lucy Fallon on Twitter: "So... @T_Leech and I had a race last night and now I have a massive carpet burn on my knee... https://t.co/lXtOhZglnf" / Twitter
Friction burn - Wikipedia
My Girlfriend's heart-shaped scab on her knee. : r/mildlyinteresting