Leathermouth started in 2007 by some friends of My Chemical Romance's rhythm guitarist Frank Iero. Iero heard a few demo songs from the band, and wanted to sign the band to his own independent label. He later joined the band after the first lead singer did not write any lyrics to the songs. As a member of Leathermouth, this is the first band where he writes the lyrics and does lead vocals. Iero uses the band as a way to express about the way he sees the world and also to let out his personal problems with depression and anxiety. Leathermouth played their first shows in the summer of 2008 alongside Warship for the Fall 2008 Reggie and the Full Effect "Farewell Tour". Iero hopes to tour with Leathermouth when he is not working with My Chemical Romance.