Learn about skin cancer basics

The photo shows two types of skin melanoma on the neck and back of a man.

The ABCDE rule is a guide to the usual signs of melanoma.

Changes in the existing moles or new moles can be a sign of skin cancer. Doctor may want to remove them in some cases if there is a risk of cancer.

Melanoma is the most dangerous form of skin cancer. These cancerous growths develop when pigment-producing cells—known as melanocytes—mutate and become cancerous.

Basal cell carcinoma is a skin cancer that grows on parts of your skin that get a lot of sun.

Skin cancer is quite common, occurring in one in five Americans. But new treatment options can help improve prognosis and survival if people find the cancer at an early stage.

Three main layers of the skin are - epidermis, dermis, and subcutis.

Squamous cell carcinomas, also called epidermoid carcinoma, is a type of skin cancer that result from squamous cells. These cells form the surface of the skin lining of hollow organs in the body.

There are three main types of skin cancer . The different types of skin cancer are named for the skin cell where the cancer develops -  basal cell carcinoma, squamous cell carcinoma and melanoma. The most serious of them is melanoma.

Human papillomavirus (HPV) is ubiquitous in skin and has been linked with nonmelanoma skin cancer. Human papillomaviruses (HPVs) consists of more than 200 related viruses. More than 40 HPV types can be easily spread through sexual contact, contact from the skin and mucous membranes of infected people.

While symptoms of the skin cancer can vary, new or unusual growths, or any changes in existing moles, may be early signs of the skin cancer.

Skin cancers are cancers that originate from the skin. They are due to the development of abnormal cells that have the ability to spread to other parts of the body.

Lentigo maligna is an early form of melanoma in which the malignant cells are confined to the tissue of origin, the epidermis. It is often reported as 'in situ' melanoma.

Melanoma is the most dangerous form of skin cancer. These cancerous growths develop when pigment-producing cells—known as melanocytes—mutate and become cancerous.

Skin cancer may spread from where it began to other parts of the body. The method used to stage melanoma is based on the thickness of the tumor and whether the cancer has spread to nearby lymph nodes or other parts of the body.