Basal and squamous cell cancers
Basal cell cancers and squamous cell cancers are most often found in areas that get exposed to a lot of sun, such as the head, neck, and arms, but they can occur elsewhere. Look for new growths, spots, bumps, patches, or sores that don't heal after 2 to 3 months.
Basal cell carcinomas often look like flat, firm, pale areas or small, raised, pink or red, translucent, shiny, waxy areas that may bleed after a minor injury. They may have one or more abnormal blood vessels, a lower area in their center, and/or blue, brown, or black areas. Large basal cell carcinomas may have oozing or crusted areas.
Squamous cell carcinomas may look like growing lumps, often with a rough, scaly, or crusted surface. They may also look like flat reddish patches in the skin that grow slowly.
Both of these types of skin cancer may develop as a flat area showing only slight changes from normal skin.
Actinic keratosis, also known as solar keratosis, is a skin condition that is sometimes pre-cancerous and is caused by too much sun exposure. Actinic keratoses are usually small (less than ¼ inch across), rough spots that may be pink-red or flesh-colored. Usually they develop on the face, ears, back of the hands, and arms of middle-aged or older people with fair skin, but they can occur in younger people or on other sun-exposed areas of the skin. People with one actinic keratosis usually develop many more. Some can grow into squamous cell cancers, but others may stay the same or even go away on their own. These areas can turn cancerous and should be looked at by a doctor, who can help determine if they should be treated.
Moles and melanomas
Normal moles
A normal mole is usually an evenly colored brown, tan, or black spot on the skin. It can be either flat or raised. It can be round or oval. Moles are generally less than 6 millimeters (about ¼ inch) across (about the width of a pencil eraser). A mole can be present at birth, or it can appear during childhood or young adulthood. New moles that appear later in life should be checked by a doctor.
Once a mole has developed, it will usually stay the same size, shape, and color for many years. Some moles may eventually fade away.
Most people have moles, and almost all moles are harmless. But it is important to recognize changes in a mole – such as in its size, shape, or color – that suggest a melanoma may be developing.
Possible signs of melanoma
The most important warning sign for melanoma is a new spot on the skin or a spot that is changing in size, shape, or color. Another important sign is a spot that looks different from all of the other spots on your skin (known as the ugly duckling sign). If you have any of these warning signs, have your skin checked by a doctor.
The ABCD rule is another guide to the usual signs of melanoma. Be on the lookout and tell your doctor about spots that have any of the following features:
- A is for Asymmetry: One half of a mole or birthmark does not match the other.
- B is for Border: The edges are irregular, ragged, notched, or blurred.
- C is for Color: The color is not the same all over and may include shades of brown or black, or sometimes with patches of pink, red, white, or blue.
- D is for Diameter: The spot is larger than 6 millimeters across (about ¼ inch – the size of a pencil eraser), although melanomas can sometimes be smaller than this.
Some melanomas do not fit the rules described above, so it is important to tell your doctor about any changes in skin lesions, new skin lesions, or growths that look different from the rest of your moles.
Other warning signs are:
- A sore that does not heal
- Spread of pigment from the border of a spot to surrounding skin
- Redness or a new swelling beyond the border
- Change in sensation – itchiness, tenderness, or pain
- Change in the surface of a mole – scaliness, oozing, bleeding, or the appearance of a bump or nodule
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