Credits adapted from the liner notes of
Under My Skin.
Musicians • Avril Lavigne – lead vocals, background vocals, guitar (12) •
Kenny Aronoff – percussion (6, 10), drums (6, 10) •
Josh Freese – drums (1, 8) • Victor Lawrence – cello (5, 12) •
Butch Walker – acoustic guitar (6), bass (3, 6, 11), percussion (3, 11), piano (6), electric guitar (3, 6, 11), keyboards (3), background vocals (3) • Michael Ward – guitar (1–2, 8) •
Patrick Warren – strings (6), keyboards (6),
Chamberlin (6) •
Phil X – guitar (4–5, 9–10) •
Brooks Wackerman – drums (2, 7) • Raine Maida – keyboards (5, 9), guitar (10, 12) • Chantal Kreviazuk – piano (2), keyboards (5) •
Mike Elizondo – bass (4) • Brian Garcia – percussion (4–5, 10, 12) • Sam Fisher – violin (5) • Samuel Formicola – violin (12) • Mark Robertson – violin (5, 12) • Kenny Cresswell – drums (3) • Shanti Randall – viola (5) •
Jason Lader – bass (5, 9–10, 12) • Bill Lefler – drums (4–5, 9, 12) • Static – keyboards (2) • Jon O'Brien – keyboards (1, 7–8) • Nick Lashley – guitar (10) •
Evan Taubenfeld – acoustic guitar (3, 11), drums (11), electric guitar (3, 11), background vocals (3, 11) • Ben Moody – guitar (7) • Alma Fernandez – viola (12)
Production • Avril Lavigne – string arrangements (5) •
David Campbell – string arrangements (7) • Don Gilmore – production (1–2, 7–8) •
Tom Lord-Alge – mixing (3–7, 9–12) •
Randy Staub – mixing (1–2, 8) • Butch Walker – programming (3, 6, 11), producer (3, 6, 11) • Raine Maida – producer (4–5, 9–10, 12), digital editing (5, 9, 12), string arrangements (5, 12) • Chantal Kreviazuk – string arrangements (5, 12) • John Rummen – art direction, design •
Leon Zervos – mastering • Brian Garcia – digital editing (4–5, 9–10, 12) • Dan Certa – additional engineering (1–2, 7–8), editing (1–2, 7–8) • Kim Kinakin – art direction, design • Jason Lader – programming (5, 9–10, 12), digital editing (4–5, 9–10, 12) • Dan Chase – Pro Tools engineering (6) • Jon O'Brien – programming (1–2, 7–8) • Static – programming (2) • Christie Priode – production coordinator (6, 11) ==Charts==