Squamous cell carcinoma IS a cancer, BSS.
We're talking skin-type cancers. Ranked from most severe and potentially life-threatening to less than that, they are:
Melanoma - this is one not to mess with. It can kill you graveyard dead if not treated in time, because it metastisizes and tends to be aggressive.
Squamous - this one is potentially serious. In a small percentage of cases, it spreads and yes, can kill you. But normally, just excising it does the trick. The surgeon has to make sure he gets it all.
Basal cell - the worst this can do when it's finally treated (and yes, it can kill you in extreme, very rare cases) is create a gash or hole that isn't real pleasant because of the sheer amount of meat that they have to take out to make sure they get it all. But it's slow growing and not aggressive - usually. I had one (a spot about a quarter inch) removed from above my right eye. The surgeon took out a chunk of meat about 2 inches across. After healing, I got a nice scar running through my eyebrow and half my forehead.