Blackheads, whiteheads, cysts, are common skin frustrating conditions caused by this class of bacteria(Propioni-bacterium acne). It's important to understand the types of acne so you may better understand how to treat it. Comedonal lesions include blackheads (open comedo) or whitehead (closed comedo). Severe lesions are often infected or inflamed, red, and raised. The milder and more common lesions are called papules or pustules. The large, painful lesions buried within the skin are known as cysts and are responsible for most acne scarring.
There are four main presentations of acne: Irregular skin exfoliation, inflammation, excess oil production, and bacteria (P. acnes). Excess oil makes the dead skin cells stick together, clogging the pores and often causing blackheads or whiteheads. Bacteria then settles into the pores and causes inflammation, which results in redness and infection. The only true mechanism of cure is by killing the bacteria, and secondly preventing the medium that enhances the growth of bacteria.