pressed home button too much?

I just noticed this while I read some threads here and I think I've used/pressed the home button too much that it sank? Don't know if its the right term but obviously its not. but that's what kinda happened. is this alright? should i get it fixed? anyone has the same experience?

 

Its been a year and 2months now..I guess the warranty doesnt cover it from now on?

Nope, it doesnt. But it bugs me, I think im a rough user on my ipod.. lol