Skin cancer is the most common cancer in the United States. It affects about 1 in 5 Americans during their lifetimes.
Skin cancer is divided into different types based on the type of skin cells it develops in. Symptoms vary between skin cancer types.
For example, melanomas are often dark in color, and squamous cell carcinoma may be red and scaly. However, appearances can vary, even in a specific type of skin cancer, depending on your skin color.
Keep reading to learn about the different types of skin cancer (including precancerous skin conditions), what causes them, what they typically look like, and risk factors.
Actinic keratosis, also known as solar keratosis, is a pre-cancerous growth that appears as a rough patch of skin. It may be pink or red, but can also be flesh-colored or pigmented.
This condition is very common and is caused by chronic exposure to ultraviolet (UV) light found in sunlight. About
- scalp
- ears
- forearms
- face
- hands
Risk factors
- being older
- being male
- having fair skin
- living close to the equator
- being exposed to the sun for long periods of time
- having a family history of actinic keratosis
- having a compromised immune system
Treatment
Most dermatologists recommend treating actinic keratosis to keep it from progressing into squamous cell carcinoma.
Treatment options are divided into lesion-directed treatments that target individual spots and field-directed treatments that treat a wide area.
Lesion-directed treatment options include:
- cryosurgery
- curettage (shaving)
- surgery
Field-directed treatments include:
- dermabrasion
- laser therapy
- chemical peel
- photodynamic therapy
- topical medications, such as 5-fluorouracil, imiquimod, diclofenac sodium, and ingenol mebutate
Basal cell carcinoma is the most common form of cancer in humans, affecting about
It usually appears as a raised, pearly or waxy pink bump, often having a dimple in the middle. It can also appear translucent with blood vessels near the skin’s surface.
In some skin types, particularly darker skin types, basal cell carcinoma can also appear to be darker or pigmented.
The prime cause of basal cell carcinoma is exposure to UV light, either through sunlight or indoor tanning equipment like tanning beds or lamps. UV light damages the DNA in skin cells and causes them to grow uncontrollably.
About
Risk factors
Risk factors include:
Treatment
Basal cell carcinoma usually isn’t life threatening and rarely spreads to other parts of your body. It’s highly treatable when treatment is started early. The most common treatment option is surgery. Other treatment options include:
- radiation therapy
- topical chemotherapy
- cryosurgery
- targeted therapy
- immunotherapy
Squamous cell carcinoma is the
It usually appears as red, scaly, and rough skin sores, typically on sun-exposed areas such as your hands, head, neck, lips, or ears. It can also develop inside of scars or chronic open sores.
Squamous cell carcinoma can also appear darker or pigmented, especially in people with darker skin.
Red patchy sores can also be a sign of the earliest form of the cancer called squamous cell carcinoma in situ (Bowen’s disease).
The most common cause of squamous cell carcinoma is UV light exposure. Long-term exposure to chemicals that cause cancer such as some chemicals in cigarettes can also lead to its development.
Some types of human papillomavirus (HPV) may also cause squamous cell carcinoma, especially if the cancer develops on the genitals.
Risk factors
Risk factors for squamous cell carcinoma development include:
- having fair skin
- having a weakened immune system
- having a history of skin cancer
- being over age 50
- being male
- having a condition that increases sun-sensitivity
- having a history of HPV
- having actinic keratosis
Treatment
Squamous cell carcinoma is typically more aggressive than basal cell carcinoma and can spread to other body parts if left untreated. It can usually be cured when treated early.
Treatment options include:
- surgery
- radiation therapy
- electronic skin surface brachytherapy (type of radiation therapy)
- fluorouracil
- imiquimod
Melanoma occurs in melanocytes, which are skin cells that create pigment. It’s caused by gene changes inside melanocytes that cause the cells to become cancerous. Exposure to UV light and genetic factors play a role in its development.
While overall less common than basal and squamous cell carcinoma, melanoma is by far the most dangerous. It makes up about 1 percent of skin cancers but is responsible for most skin cancer deaths.
Melanoma can start anywhere on your body, such as the chest, neck, legs, and face. It can also occur in areas that don’t typically receive exposure to the sun, such as fingernail beds, the palms of the hands, and the soles of the feet.
Mucosal melanoma can also develop in mucus membranes lining the nose, mouth, and the digestive and urinary tracts.
According to the Skin Cancer Foundation, the 5-year survival rate when caught early is 99 percent, but this drops to 66 percent if it reaches your lymph nodes and 27 percent if it reaches a distant organ.
Melanoma may first appear as changes to an existing mole or as a new mole. Melanoma can be suspected if a mole has any of the “ABCDE” characteristics:
- Asymmetrical shape
- Border irregularities
- Color that isn’t consistent
- Diameter larger than 6 millimeters
- Evolving size or shape
Risk factors
Risk factors for developing melanoma include:
- being exposed to UV light
- having many moles or atypical moles
- having a family history of melanoma
- having fair skin and light hair
- having a history of skin cancer
- having a weakened immune system
- being older
- being male
- having xeroderma pigmentosum
Treatment
Surgery is usually used to remove early-stage melanoma. Other treatments include:
- immunotherapy
- targeted therapy drugs
- chemotherapy
- radiation therapy
The four major types of melanoma
Melanoma can be divided into different subtypes. A few of the most common subtypes are:
- Superficial spreading melanoma. Superficial spreading melanoma is the most common type of melanoma. Lesions are usually flat, irregular in shape, and contain varying shades of black and brown. It can occur at any age.
- Lentigo maligna melanoma. Lentigo maligna melanoma usually affects adults over 65 and involves large, flat, brownish lesions.
- Nodular melanoma. Nodular melanoma can be dark blue, black, or reddish-blue, but may have no color at all. It usually starts as a raised patch.
- Acral lentiginous melanoma. Acral lentiginous melanoma is the least common type. Typically it affects the palms, soles of the feet, or under finger and toenails.
Kaposi’s sarcoma is a type of cancer that involves skin lesions that are brownish-red to blue in color and usually found on the legs, feet and face.
The skin lesions can also be found on the genitals and in the mouth. Kaposi’s sarcoma can also affect lymph nodes and internal organs. It affects the cells that line lymph or blood vessels close to the skin.
This cancer is caused by a type of herpes virus, typically in people with weakened immune systems such as those with AIDS or those taking immunosuppressant drugs after an organ transplant.
There are other, less commonly thought of
Risk factors
Risk factors for Kaposi’s sarcoma development include:
- being of Jewish, Mediterranean, or equatorial African descent
- being male
- having a human herpesvirus 8 infection
- having a weakened immune system
- living with AIDS
Treatment
Six types of treatment are used as standard treatment:
- highly active antiretroviral therapy (HAART)
- radiation therapy
- chemotherapy
- immunotherapy
- cryosurgery
- surgery
About
While there are several different types of skin cancers, most share the same risk factors, including:
- being exposed to UV rays found in sunlight and tanning equipment for long periods
- being over the age of 40
- having a family history of skin cancer
- having a fair complexion
- being immunocompromised
Even though it’s less common, young people and people with dark complexions can still develop skin cancer. It’s important to see a dermatologist for a proper diagnosis if you notice any new skin spots that could be cancerous.
The quicker skin cancer is detected, the better the long-term outlook.
Skin cancer is the most common type of cancer in the United States. The appearance of skin cancer can vary widely and depends on the type of cells affected. It’s important to visit a dermatologist if you notice any abnormal spots that could be cancerous.
Taking preventive measures to avoid UV rays, such as wearing sunscreen or limiting your time in the sun, can help prevent against all types of skin cancer.