I read this Headcanon that Francis cuts and when he does cut, he carves the words that people call him on a daily basis onto his wrist. Imagine him and Arthur getting into a huge fight and Francis feeling really bad about it. So he carves 'Bloody Frog' into his wrist. Now, wait about fifteen minutes, Iggy walks into his and Francis' room to apologize, he finds his husband passed out on the floor from blood lose. His arm laying in a puddle of blood. Arthur sees all the other thing on his husband's wrist and is just shocked. But than, his eyes land on Francis' most recent doing and an indescribable guilt washes over Arthur.