Skin cancer is cancer that starts as a growth of cells on the skin. The cells can invade and destroy healthy body tissue.
Many kinds of skin cancer exist. The most common skin cancers are basal cell carcinoma and squamous cell carcinoma. While these are the most common, they often can be cured. The most dangerous form of skin cancer is melanoma. It is more likely to spread, making it harder to cure.
Most skin cancers happen on skin that gets a lot of sunlight. The light that comes from the sun is thought to cause most skin cancers. You can reduce your risk of skin cancer by covering your skin with clothes or sunscreen to protect it from the sun.
Some skin cancers happen on skin that doesn’t typically get sun. This likely means that something else is causing these cancers. To reduce your risk of these kinds of skin cancers, check your skin regularly for any changes. Report these changes to your healthcare professional.
I recommend annual full body skin exams with a dermatologist. If you have any concerning skin lesions, please contact our office at (707) 938-1255 or your dermatologist to schedule a visit.

MD, Board-Certified Internist, Concierge Medicine Physician
Dr. Guy Delorefice has been practicing in Sonoma County since 1999 as a board-certified internist. He earned a degree in Biology from St. Mary’s College of California, then completed his medical degree at Creighton University. While at Creighton, he launched medical clinics in third-world countries and became fluent in Spanish. His internship and internal medicine residency were completed at Providence St. Vincent’s Medical Center in Portland, Oregon. After finishing his training, he relocated to Sonoma County to be closer to home and family. Dr. Guy has built a reputation for exceptional patient care and has been voted by peers as a top physician in his specialty in consecutive years.
Outside medicine, he is deeply family-oriented — married to Rebecca, father to Lani and Capri, with a black lab named Hank. He’s passionate about the outdoors and spends time mountain biking, road biking, abalone diving, fishing, hunting, and skiing. He’s often seen biking around Sonoma with his family.