Types of acne
Acne Vulgaris is the most common form of acne which includes several types of pimples. These acne lesions include blackheads, whiteheads, papules, pustules, nodules and cysts.
Whiteheads
Whiteheads result when a pore is completely blocked, trapping sebum  (oil), bacteria, and dead skin cells, causing a white appearance on the  surface. These types of acne lesions sometimes seem to be begging to be  popped.
Make sure you read about how to pop a pimple  before you attempt this. Whiteheads are normally quicker in life cycle than blackheads.
Blackheads
  Blackheads result when a pore is only partially blocked, allowing some  of the trapped sebum (oil), bacteria, and dead skin cells to slowly  drain to the surface. The black color is not caused by dirt. Rather, it  is a reaction of the skin's own pigment, melanin, reacting with the  oxygen in the air.
A blackhead tends to be a stable structure, and can often take a long time to clear.
Papules
A               papule is defined as a small (5 millimeters or less),  solid lesion              slightly elevated above the surface of the  skin. A group of very              small papules and microcomedones may  be almost invisible but have a              "sandpaper" feel to the  touch. A papule is caused by localized              cellular reaction to  the process of acne. This photo shows papules              and  comedones on the face of an acne patien
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