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Review scores
Source	Rating
Allmusic
Blender
Entertainment Weekly	(B)
The Guardian
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Rolling Stone
Slant Magazine
Yahoo! Music	(6/10)
Billboard
Q Magazine
The A.V. Club	(C)

Under My Skin is the second studio album by Canadian singer-songwriter Avril Lavigne that was released through the RCA Records Label internationally throughout May 2004. Lavigne wrote most of the album with singer-songwriter Chantal Kreviazuk, who invited her to a Malibu in-house recording studio shared by Kreviazuk and her husband Raine Maida, where Lavigne recorded many of the songs. The album was produced by Maida, Don Gilmore, and Butch Walker.

Under My Skin debuted at number-one on the U.S. Billboard 200 albums chart and according to Billboard magazine, was ranked number 149 on the list of top-selling albums of the 2000s. It has sold more than 14 million copies worldwide, 3 million of which were sold in the United States, ranking the album No. 149 on the Billboard 200 Decade End Chart.Album has sold more than 18 million copies worldwide till september 2015. Because of the album's darker and heavier, more aggressive vibe reminiscent of post-grunge, nu metal and more melodic rocker songs, it received generally positive reception from critics.

Having no plans of working with producers or professional writers, Lavigne wrote much of the album with Canadian singer-songwriter Chantal Kreviazuk, with whom she had developed a friendship in the summer of 2003. Kreviazuk, whose husband Raine Maida's band Our Lady Peace opened for Lavigne's concert in Europe, introduced herself at an after-party for the SARS benefit concerts held in Toronto in June 2003. The following day, Lavigne and Kreviazuk ate lunch together, during when Lavigne shared how she wanted the development of the album to be. They wrote songs for almost three weeks at Maida's warehouse in Toronto. Kreviazuk invited Lavigne to continue working in a Malibu, California house she shared with Maida, which contained a recording studio. Many of the tracks in the album were recorded in Malibu.

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