The bacterium P. acnes which plays an important role in the inflammatory types of acne is lived deep of our hair follicle and is not easily accessible, even by close contact. P.acnes is active when the opening of our pore (i.e. openings of the follicles to the surface of the skin) is blocked off from the surface of the skin that cuts off the oxygen supply, i.e. under condition of very low oxygen concentration. In a way, this also makes the chances of spreading P.acnes bacterium less likely because there is less access to the outside world.
By the time we see a pustule (i.e. inflamed or red and swollen lesions that are topped with pus), that is the stage where our body has reacted to the infection and the pus is mostly a mixture of a lot of dead bacteria, white blood cells and skin cells, along with other complicated and minute factors that create inflammation.
Even though P. acnes can colonize our nose and be responsible for local spread of acne to our face and back through contact, such as from touching our nose and then touching our face or back, it is not known to spread from person to person and is not considered contagious.
You may want to view here for details about what does acne look like?
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