Among them are benign nevi or moles and a lesion called dermatofibrosis.

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With sun exposure, the skin may over time develop freckles, moles or lentigines.

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"Some could have been bitten by insects such as mosquitoes, and in other cases there were moles, or skin pigmentation, and we couldn't find a needle puncture wound, " said Wang, speaking at the news conference.

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