How to delete albums on iPhone 4s?

Hi can someone please help. Basically a couple of days ago I went to my friends house to do something on iTunes an little did I know that his albums had synced to my photo library. Please tell me how I can delete them as I can't do it on the phone and the albums also aren't showing up on iTunes. Please help!

Try going into music (on your phone) then albums and slide your finger across the album and 'delete' should come up just press that. If that doesn't work then I don't know, sorry;xoxo