Types of skin cancer
Skin cancer may initially appear as a bump, nodule or irregular patch on the surface of the skin. As the cancer grows, the size or shape of the visible skin mass may change. As these visible changes are occurring, the cancer is likely expanding and moving into the lower layers of the skin.
If left untreated, skin cancer will continue to grow down into the dermis and the subcutaneous tissues. In the most advanced stages, skin cancer may spread into nearby muscle tissue, cartilage or bone. Once the cancer spreads into the blood or lymph fluids, it may reach other areas in the body, like the liver or lungs.
Types of skin cancer include melanoma, basal cell carcinoma and squamous cell carcinoma.
Keratoacanthoma are tumors that are usually benign (non-cancerous), slow growing and often go away on their own. Keratoacanthomas tumors that do continue to grow are often treated like a form of squamous cell carcinoma.