Currently, there are no approved vaccines for the treatment of acne. The study vaccine is experimental, meaning it is still being tested, so it's only available in the form clinical studies. 

Here’s how it might work: Your body has a natural defense system against germs, such as viruses or bacteria, called the immune system. Vaccines train your immune system to fight specific germs. They usually contain harmless pieces of the germ (called antigens) that trigger your body to produce protective proteins, called antibodies.  The vaccine may train your body to produce antibodies against the C. acnes bacteria, particularly the ones related to acne.