DNA science points to better treatment for acne

Using DNA sequencing, researchers distinguish between 'good' and 'bad' strains of certain skin bacteria. The 'good' kind might be used to zap zits more effectively, they say.Ancient Egyptians were vexed by it, using sulfur to dry it out. Shakespeare wrote of its "bubukles, and whelks, and knobs, and flames o' fire."

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