Squamous cell carcinoma is a type of skin cancer that develops in the outer layer of the skin. It is caused by the abnormal growth of cells that line the surface of the skin. Although this type of cancer is not as common as other forms of skin cancer, it can be very dangerous if left untreated. There are several synonyms for squamous cell carcinoma, including cutaneous squamous cell carcinoma, squamous cell skin cancer, and epidermoid carcinoma. These terms describe the same type of cancer, and they are often used interchangeably by medical professionals. Regardless of the terminology used, it is important to seek treatment if you suspect you may have squamous cell carcinoma.