Can Penicillin cure acne?

Unfortunately, Penicillin is not effective for Acne. The bacteria that is involved in Acne is p. acnes. (Propionibacterium acnes).
This special type of bacteria is sensitive to a family of antibiotics called tetracyclines especially minocycline (Commercial names; Dynacin, Minocin, Solodyn). These bacteria are not sensitive to penicillin. Interesting fact; these p. acnes bacteria contain chemical compounds that are sensitive to blue light. Thus one of the ways to destroy them is to use high-intensity blue light (Acne phototherapy).

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