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  2. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    The most deadly form of skin cancer, malignant melanoma, is mostly caused by DNA damage independent from UVA radiation. This can be seen from the absence of a direct UV signature mutation in 92% of all melanoma. [69] Occasional overexposure and sunburn are probably greater risk factors for melanoma than long-term moderate exposure. [70]