Skin cancers have become a lot more common over the last decade. The most common is the Basal Cell Carcinoma (often known as a Rodent Ulcer). Although a form of skin cancer they will not spread around the body. However, it is important to treat them as early as possible when they are small. Surgery is the best first line treatment. This will usually be by direct excision but occasionally need more complex surgery to treat.
Other skin cancers include Sqaumous Cell Carcinoma and Melanoma. These cancers do have the potential to spread and it is very important to treat these properly with surgery at an early stage. Any reddened, scaly or ulcerated skin areas that appear to be enlarging or not resolving should be checked. Melanoma is usually pigmented and often has an irregular edge, differing colours within it and may itch. Cancers will always get bigger but may take a long time to grow. This is not exhaustive and if in doubt see your GP, Plastic Surgeon or Dermatologist.