Squamous cell carcinoma (SCC) is a common type of skin cancer that originates in the squamous cells, which make up the middle and outer layers of the skin. It can also occur in other tissues where these cells are present, such as the lungs, throat, and cervix. SCC is generally characterized by the uncontrolled growth of abnormal cells, which can invade surrounding tissues and potentially metastasize to other parts of the body.