What causes squarmis cell carcinoma?

Depends on location: The most common form of squamous cell carcinoma (scc) occurs on skin, with sun damage being the leading cause. Scc can also occur in the esophagus, lung, oral cavity, and anal canal. Prolonged exposure to irritants such as smoking and chewing tobacco can lead to increased risk of scc in the lung and oral cavity. A certain type of virus (human papillomavirus) can also increase the risk of scc.

Squamous cell ?: I think that this is what you mean. This is a group of cancers that occur on lining surfaces or organs or the skin. This type of cancer is usually diagnosed by its microscopic appearance and by certain special stains. The significance depends on the organ it is from.