Is this a computer virus or just a freakish extra hand?

When I open media online to play (i.e. media players for say Nick toons and the like), no matter what website I am on, when my little mouse turns to the white hand when I try to click on the players ons, it sometimes also has a "ghost" hand that flashes with it. This "ghost" hand looks just like a frankenstein hand, as in it's green and montster like and quite a bit bigger than the usual mouse hand. It flashes for a moment when the mouse hovers over the play on and other ons like that. It's not solid or transparent but sort of static-y looking? I am worried it is a virus, seeing that it appears on several websites not just one. Any thoughts or suggestions. It's freaking me and my wife out a little. Thanks