The Definition of Acne

The Definition of Acne

In this article we will know about The definition of Acne, the hair follicle is the part of the skin where hair grows. It is attached to the sebaceous gland (oil gland), which produces sebum that lubricates the hair and prevents the skin from becoming dry. The opening at the surface of the skin, with the attached hair, is known as the skin pore. Big pores are associated with significant oil glands that produce higher amounts of oil. The oil glands are triggered to produce oil by being exposed to male hormones called androgens. Females also produce androgens at lower quantities via the ovaries or adrenal glands. During puberty, there is a surge of sex hormones and androgens causing the oil glands to pump more oil.

Acne is a disease of the skin that is caused by the excess production of keratin inside the hair follicles (hyperkeratinization) and excessive oil secretion of the sebaceous glands (oil glands). These two conditions cause dead skin cells and excess oil to be trapped inside the pores, and this results in pore clogging and the formation of a comedo. Trapped sebum and dead skin cells in the pore are the primary food source of the acne-causing bacteria known as Propionibacterium acnes. The availability of more sebum causes the population of the bacteria grow.

When the clogged pores are fully closed, the comedo has a whitish appearance on the skin surface and is called a white head. When the clogged pores are partially opened, it is called a blackhead. The partially opened orifice allows the slow drainage of sebum, bacteria and dead skin cells on the surface. Blackheads have the characteristic dark color because of the reaction of melanin to oxygen in the surrounding air. Once the bacterial population inside the pore increases at a critical level, the pores become infected often producing pus and breaking out. This type of lesion is called pustule, pimple or zit. It is similar to a whitehead, but it has a red base and a yellowish center when you view it from the top.

Severe acne has the following lesions:


These are pimples which are more significant than 5mm. They can be painful and grows as large bumps beneath the skin surface. Scarring is widespread with this type of lesion. These lesions last for several months.


These are painful sac-like, pus-filled lesions that may cause scarring. It is similar to a nodule but it is pus-filled, and they usually have a diameter of 5mm or more. Do not squeeze cysts as they may cause scarring.


Also known as pseudo scars because they somewhat look like a scar but unlike "true scars" they leave no permanent injury or mark. They are temporary flat, light red or pink spots that have been gone from a previously healed lesion. They may last from several days to a few weeks. Sometimes they are raised slightly from the surface of the skin.

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