Causative Agent
Propionibacterium acnes is associated with Acne vulgaris (pimples), but it is not the sole cause of it. Propionibacterium acnes is a Gram positive, non-spore forming, anaerobic pleomorphic bacillus found in clinical specimens. The morphology and arrangement of Propionibacterium acnes is similar to that of Corneybacterium, but is non-toxigenic. Propionibacterium acnes is normal flora but ferments glucose leading to the production of propionic acid. It can also produce catalase along with indole, nitrate, or both indole and nitrate ("Propionibacterium acnes3").
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