Squamous Cell Carcinoma

Squamous cells are found in the upper layer (the surface) of the epidermis. They look like fish scales under a microscope and present as a crusted or scaly patch of skin with an inflamed, red base. They are often tender to the touch. It is estimated that 250,000 new cases of squamous cell carcinoma are diagnosed annually and that 2,500 of them result in death.

Squamous cell carcinoma can develop anywhere, including inside the mouth and on the genitalia. It most frequently appears on the scalp, face, ears and back of hands. Squamous cell carcinoma tends to develop among fair-skinned, middle-aged and elderly people who have a history of sun exposure. In some cases, it evolves from actinic keratoses, dry scaly lesions that can be flesh-colored, reddish-brown or yellow black, and which appear on skin that is rough or leathery. Actinic keratoses spots are considered to be precancerous.

Like basal cell carcinoma, squamous cell carcinoma is diagnosed via a biopsy — either excisional, where the entire tumor is removed along with some of the surrounding tissue, or incisional, where only a part of the tumor is removed (used primarily for large lesions).

Treatments for basal cell carcinoma include:

• Cryosurgery — Some basal cell carcinomas respond to cryosurgery, where liquid nitrogen is used to freeze off the tumor.
• Curettage and Desiccation — The preferred method of dermatologists, this treatment involves using a small metal instrument (called a curette) to scrape out the tumor along with an application of an electric current into the tissue to kill off any remaining cancer cells.
• Mohs Micrographic Surgery — The preferred method for large tumors, Mohs Micrographic Surgery combines removal of cancerous tissue with microscopic review while the surgery takes place. By mapping the diseased tissue layer by layer, less healthy skin is damaged when removing the tumor.
• Prescription Medicated Creams — These creams can be applied at home. They stimulate the body’s natural immune system over the course of weeks.
• Radiation Therapy — Radiation therapy is used for difficult-to-treat tumors, either because of their location, severity or persistence.
• Surgical Excision — In this treatment the tumor is surgically removed and stitched up.

Melanoma

While melanoma is the least common type of skin cancer, it is by far the most virulent. It is the most common form of cancer among young adults age 25 to 29. Melanocytes are cells found in the bottom layer of the epidermis. These cells produce melanin, the substance responsible for skin pigmentation. That’s why melanomas often present as dark brown or black spots on the skin. Melanomas spread rapidly to internal organs and the lymph system, making them quite dangerous. Early detection is critical for curing this skin cancer.

Melanomas look like moles and often do grow inside existing moles. That’s why it is important for people to conduct regular self-examinations of their skin in order to detect any potential skin cancer early, when it is treatable. Most melanomas are caused by overexposure to the sun beginning in childhood. This cancer also runs in families.

Melanoma is diagnosed via a biopsy. Treatments include surgical removal, radiation therapy or chemotherapy.

What to Look For

The key to detecting skin cancers is to notice changes in your skin. Look for:

• Large brown spots with darker speckles located anywhere on the body.
• Dark lesions on the palms of the hands and soles of the feet, fingertips toes, mouth, nose or genitalia.
• Translucent pearly and dome-shaped growths.
• Existing moles that begin to grow, itch or bleed.
• Brown or black streaks under the nails.
• A sore that repeatedly heals and re-opens.
• Clusters of slow-growing scaly lesions that are pink or red.

The American Academy of Dermatology has developed the following ABCDE guide for assessing whether or not a mole or other lesion may be becoming cancerous.

Prevention

Roughly 90% of nonmelanoma cancers are attributable to ultraviolet radiation from the sun. That’s why prevention involves:

• Staying out of the sun during peak hours (between 10 a.m. and 4 p.m.).
• Covering up the arms and legs with protective clothing.
• Wearing a wide-brimmed hat and sunglasses.
• Using sunscreens year round with a SPF of 15 or greater and sunblocks that work on both UVA and UVB rays. Look for products that use the term “broad spectrum.”
• Checking your skin monthly and contacting your dermatologist if you notice any changes.
• Getting regular skin examinations. It is advised that adults over 40 get an annual exam with a dermatologist.