Acne - What Is Acne?
Acne is a common skin disease that results when pores
get blocked and bacteria form inside them. It comes in a variety of
familiar forms and affects nearly everyone at some stage, particularly
in their teen years. The inflamed, red bumps that sometimes form can be
painful, and even painless white pimples are unsightly.
In the surface of the skin are pores, tiny openings called a hair
follicle. Deeper inside the pore, near the base of the follicle, there
are sebaceous glands that produce sebum, a natural type of oil. That oil
helps keep the skin flexible and protected.
Hair continues to grow through the surface, while oil or sebum oozes out
the side and is spread around the area. Skin cells grow and die and are
sloughed off through washing, rubbing or spontaneously. But that process
can be interrupted when the pores close and when bacteria form inside
them. The result is acne.
The white pimples that sometimes form are usually a combination of dead
skin cells, white blood cells and bacteria. The trapped pus often
creates an inflamed, red area around it. The term 'pus' is an adaptation
of 'pustule', a type of acne that results when the follicle wall bursts
and the white blood cells rush into the area as part of a healing
process.
When the tiny bumps or spots appear black they're called blackheads,
naturally enough. They're a non-inflamed form of acne that come from the
material having poked through the surface. Their dark color isn't the
result of contact with dirt on the skin. It's a combination of dead skin
cells and sebum that have oxidized. Oxygen in the air causes a chemical
reaction that turns them black.
Often, however, the material doesn't break the skin, but simply pushes
it up, forming a small, white bump called whiteheads. One form are known
as 'milia'. Normally dead skin cells will get washed off or simply fall
off the surface. But they can get trapped underneath the surface. This
type of acne is common among infants, but can affect people at any age.
All these variations go by a general medical term called 'comedones',
and whether that formation is open or closed is part of the clinical
difference between them.
As the acne develops it can variously form what are called papules,
nodules or cysts. A papule forms when the walls holding the hair
follicle burst near the surface. They're small and don't contain pus. A
nodule is a hardened lump under the skin, resulting from a break at the
base of the follicle. A cyst is a larger, reddened bump. They're soft,
but can be very painful.
Naturally, while it's helpful to know what acne is, the most important
thing is to be able to treat it. In order to do that, it's necessary to
know what type we have. We turn to that next...
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P.Robertson
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