Basal cell carcinoma
According to the American Cancer Society, basal cell carcinomas are the most common type of skin cancer, and approximately eight out of every 10 non-melanoma skin cancers will be basal cell carcinoma. These cancers develop within the basal cell layer of the skin - the lowest part of the epidermis.
This type of skin cancer tends to occur in areas of the skin that receive the most exposure to the sun, like the head and neck. Basal cell cancers usually grow slowly, and it is rare for them to spread, or metastasize, to nearby lymph nodes or even more distant parts of the body. However, this can occur if the cancer is left untreated, so early detection and treatment is important.
Basal cell cancers can also recur in the same place that the original cancer was found. Patients who have had basal cell carcinoma once have an increased risk of developing a new basal cell cancer elsewhere. Potentially as many as 50 percent of these patients will develop a new basal cell carcinoma within five years of the first diagnosis.