It's important to think of squamous cell carcinomas in two ways. One, squamous cell carcinomas that come from the skin. Two, squamous cell carcinomas that come from elsewhere, like inside the mouth, the stomach or the esophagus. Squamous cell carcinomas that arise from the skin have excellent prognosis.
Excision is oftentimes the only thing needed for a cure. Squamous cell carcinomas often present in sun exposed areas. It can present as rough, scaly skin that doesn't go away with a regular moisturizing routine. If you notice a scaly or rough spot, that's not going away with regular moisturizer it's important to see a dermatologist to get a biopsy to get a definitive diagnosis.