My Mobile Phone is A Sony Ericsson K770i it's on the 3 network contract.. DUNNO IF THAT HELPS..
But anyway i put my phone down.. left it and when i came back, half the bottom side of the phone had gone all strange and rough, almost like it melted and then turned back into plastic again.. it's really strange.. im scared to put it on charge incase it catches on fire!!

PLEASE HELP WHAT DO I DO!??!!