Prevention

To reduce your risk of basal cell carcinoma you can:

• Avoid the sun during the middle of the day. In many places, the sun's rays are strongest between about 10 a.m. and 4 p.m. Schedule outdoor activities for other times of the day, even during winter or when the sky is cloudy.
• Wear sunscreen year-round. Use a broad-spectrum sunscreen with an SPF of at least 30, even on cloudy days. Apply sunscreen generously, and reapply every two hours — or more often if you're swimming or perspiring.

• Wear protective clothing. Cover your skin with dark, tightly woven clothing that covers your arms and legs, and a broad-brimmed hat, which provides more protection than does a baseball cap or visor.

  Some companies also sell protective clothing. A dermatologist can recommend an appropriate brand. Don't forget sunglasses. Look for those that block both types of UV radiation — UVA and UVB rays.

• Avoid tanning beds. Tanning beds emit UV rays and can increase your risk of skin cancer.

• Check your skin regularly and report changes to your doctor. Examine your skin often for new skin growths or changes in existing moles, freckles, bumps and birthmarks. With the help of mirrors, check your face, neck, ears and scalp.

  Examine your chest and trunk and the tops and undersides of your arms and hands. Examine both the front and the back of your legs and your feet, including the soles and the spaces between your toes. Also check your genital area and between your buttocks.