My 2yr old MBP started showing a peculiar wear on the body approximately in a year after purchase. The right palm rest edge (above the status LED and to the right) started darkening and became quite rough. Initially I assumed it was some sort of my mishandling, yet a couple of days ago I spotted that my friends computer has the same problem. Both of us use computers mainly at home and wear watches on the left arm only- I cannot think of any other source of this problem. Has anyone experienced such wear? I have also realised mine's lid is noticeable offset (1-1.5mm of the above edge is not covered). Though the friends MBP seems to be OK. Could I possibly have readjustment / repair for this issue under warranty?