When the trapped sebum and bacteria stay below the skin surface, a whitehead is formed. Whiteheads may show up as tiny white spots, or they may be so small that they are invisible to the naked eye.
Blackhead
A blackhead occurs when the trapped sebum and bacteria partially open to the surface and turn black due to melanin, the skin's pigment. It is not dirt and can not be washed away. Blackheads can last for a long time because the contents very slowly drain to the surface.
A blackhead or whitehead can release its contents to the surface and heal. Or, the follicle wall can rupture and inflammatory acne can ensue (see below). This rupture can be caused by random occurence or by picking or touching the skin. This is why it is important to leave acne prone skin relatively untouched.
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