I'm having a problem with my T.V. this white thing appears in the left hand corner of my screen it looks like a hill and I can't use anything wet on my Television and it's bugging me what could it be?

Can you take a picture and post it? What kind of TV is this? A make and model would help. But at the least tell us if it's a Tube, LCD, Plasma, LCD-LED, etc.

EDIT: Also try other inputs and tell us if it is still there on said inputs.