Basal cell carcinoma, squamous cell carcinoma and melanoma look different, affect different cells and grow in different ways, but they have one thing in common: They can be prevented. "The most important thing to remember is that 60 to 80 percent of sun damage happens in the first 20 years of the life," dermatologist Eduardo Weiss said. "Applying broad-spectrum, water-resistant sunscreens with an SPF of 15 or higher, wearing sun protective clothing and staying out of the sun at peak hours, between 10 a.m. and 4 p.m., is very important."

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