Front part of the iphone is bulging out

So guys ill get to the case, i was recharging my iphone 4 via a usb connected to my pc and i accidently pulled the usb so the iphone just fell to the ground, now when i came to pick it up i noticed the home button is inside the iphone and not outside of it,still worked perfectly,i thought it broke because of the fall and then i realized my whole front is popped outside abit, i can see some lights from inside and stuff, now the question is do i push it back in or do i just give it to a professional, i dont wanna ruin my iphone, but i dont wanna waste money and a problem i can fix myself

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thanks.