Non melanoma skin cancer is different from melanoma. Melanoma is the type of skin cancer that most often develops from a mole.Non-melanoma skin cancers usually develop in the outermost layer of skin (epidermis) and are often named after the type of skin cell from which they develop. Of non-melanoma skin cancer, basal cell carcinoma (BCC) has not been reported to the Cancer Registry of Norway since it does not spread like other cancers. It is estimated that there are about 12,000 new lesions each year. Of squamous cell carcinoma (SCC), there were 1717 cases registered in 2013 in Norway. All of the other subgroups are considerably more rare. Between 5 to 20 cases occur annually.
It is estimated that basal cell carcinoma will spread to other parts of the body in less than 0.5% of cases. The risk is slightly higher in cases of squamous cell carcinoma, which spreads to other parts of the body in around 2-5% of cases. The signs of squamous cell carcinoma include:
•A persistent, scaly red patch with irregular borders that sometimes crusts or bleeds.
•An elevated growth with a central depression that occasionally bleeds.
•A growth of this type may rapidly increase in size.
•An open sore that bleeds and crusts and persists for weeks.