What bacteria is responsible for acne?
Cutibacterium acnes
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Originally identified as Bacillus acnes,[10] it was later named Propionibacterium acnes for its ability to generate propionic acid.[11]
In 2016, P. acnes was taxonomically reclassified as a result of 
biochemical and genomic studies. In terms of both phylogenetic tree structure and DNA G + C content, the cutaneous species were clearly distinguishable from other species that had been previously categorized as P. acnes.[1][12]  As part of restructuring, the novel genus Cutibacterium was created for the cutaneous species,[1] including those formerly identified as Propionibacterium acnes, Propionibacterium avidum, and Propionibacterium granulosum.[3] Characterization of philotypes of C. acnes is an active field of research.[13][2][14]