More accurately, UV exposure is the major “environmental” risk factor, but other hereditary factors are much more significant: having more than 40 moles, having a changing mole, having red hair and fair skin are all much larger risk factors – independent of sun exposure. We’ve known for decades that melanoma is more common in INDOOR WORKERS who receive 4-10 times less cumulative sun exposure than outdoor workers, which affirms that its relationship with UV — and there is a relationship — is not straightforward. Again, there is nuance to the sun care message.
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