Skin cancer is largely preventable. While you definitely want to use a broad-spectrum sunscreen which blocks UVA and UVB rays with an SPF of 15 or higher, slathering on enough sunscreen is the most important factor for determining how effectively it works. If you’re spending a full day on the beach, aim to go through a small 3 to 5 oz tube. During the rainy season, when UV rays are weaker, applying an SPF moisturizer to your face and other exposed skin is probably enough. But know that there’s no hard evidence that sunscreen protects against malignant melanoma, which is the deadliest form of skin cancer, so your best protection is to minimize direct sun exposure and wear protective clothing in addition

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