Each year about 1 million Americans are diagnosed with skin cancer, by far the most common form of cancer diagnosed today, according to the Mayo Clinic.

"Fortunately, most skin cancers are preventable and highly treatable if found early," according to Carie Chui, M.D., who in a lecture this month will discuss skin cancer types, causes and most vulnerable skin types, as well as protections such as sunscreen and clothing.

"The two most common forms of skin cancer - basal and squamous cell - rarely spread through the blood stream or lymphatic system, but can damage local tissues," the dermatologist said.

Melanoma, on the other hand, can travel through the bloodstream and spread to other areas, she said. "It is really important to catch this more aggressive form early, because the risk of a melanoma spreading is closely related to the depth of the cancer growth."

Basal and squamous cell cancers may resemble a pimple or a sore that does not heal, and the squamous type might develop a crust, Dr. Chui said.

"Melanoma usually looks like a brown spot with some features that differentiate it from a regular mole, such as irregular borders or color." Any mole that bleeds or any other suspicious lesions should be checked out by a doctor, she said.

People with a history of skin cancer, or who have had a lot of sun exposure should be screened annually, the doctor said. People with fair skin, light hair and eyes also are more prone to skin cancer, she said.

"Basal and squamous cell cancers are more related to sun exposure accumulated over a lifetime, whereas melanoma is linked to severe intermittent exposure, especially in childhood."

Dr. Chui emphasized applying sunscreen with sun protection factor (SPF) 30, or higher, 30 minutes before going out, and reapplying it every two hours.

"It is important to learn how to protect ourselves because there is no way to completely avoid the sun," she said.

"What You Should Know About
Skin Cancer," will be held June 12, 12:30 - 1:30 p.m. Admission is $2, refreshments included. Call 696-5600.