Acne Information

Causes of Acne

[ Learn about acne, causes, misconceptions and treatments defined. ]

Exactly why some people get acne and some do not is not fully known. It is known to be partly hereditary. Several factors are known to be causally linked to acne:

• Hormonal activity, such as menstrual cycles
• Stress, through increased output of hormones from the adrenal (stress) glands
• Hyperactive sebaceous glands, secondary to the three hormone sources above
• Accumulation of dead skin cells
• Bacteria in the pores, to which the body becomes 'allergic'
• Skin irritation or scratching of any sort will activate inflammation
• Use of anabolic steroids
• Any medication containing halogens (iodides, chlorides, bromides), lithium, barbiturates, or androgens
• Exposure to high levels of chlorine compounds, particularly chlorinated dioxins, can cause severe, long-lasting acne, known as Chloracne.

Traditionally, attention has focused mostly on hormone-driven over-production of sebum as the main contributing factor of causing acne. More recently, more attention has been given to narrowing of the follicle channel as a second main contributing factor. Abnormal shedding of the cells lining the follicle, abnormal cell binding ("hyperkeratinization") within the follicle, and water retention in the skin (swelling the skin and so pressing the follicles shut) have all been put forward as mechanisms involved.

Several hormones have been linked to cause acne: the male hormones testosterone, dihydrotestosterone (DHT) and dehydroepiandrosterone sulfate (DHEAS), as well as insulin-like growth factor 1 (IGF-I). In addition, acne-prone skin has been shown to be insulin resistant.

Development of acne vulgaris in latter years is uncommon, although this is the age group for Rosacea which may have similar appearances. True acne vulgaris in older adults may be a feature of an underlying condition such as pregnancy and disorders such as polycystic ovary syndrome or the rare Cushing's syndrome.

Misconceptions about causes
There are many misconceptions and rumors about what does and does not cause the condition:
Diet. One flawed study purported that Chocolate, french fries, potato chips and sugar, among others, affect acne. A recent review of scientific literature cannot affirm either way. The consensus among health professionals is that acne sufferers should experiment with their diets, and refrain from consuming such fare if they find such food affects the severity of their acne. A recent study, based on a survey of 47,335 women, did find a positive epidemiological association between milk consumption and acne, particularly skimmed. The researchers hypothesize that the association may be caused by hormones (such as bovine IGF-I) present in cow milk; but this has not been definitively shown. Seafood, on the other hand, may contain relatively high levels of iodine, but probably not enough to cause an acne outbreak. Still, people who are prone to acne may want to avoid excessive consumption of foods high in iodine. It has also been suggested that there is a link between a diet high in refined sugars and acne. According to this hypothesis, the startling absence of acne in non-westernized societies could be explained by the low glycemic index of these tribes' diets. Further research is necessary to establish whether a reduced consumption of high-glycemic foods (such as soft drinks, sweets, white bread) can significantly alleviate acne, though consumption of high-glycemic foods should in any case be kept to a minimum, for general health reasons.

Deficient personal hygiene. Acne is not caused by dirt. This misconception probably comes from the fact that acne involves skin infections. In fact the blockages that cause acne occur deep within the narrow follicle channel, where it is impossible to wash them away. These plugs are formed by the cells and sebum created there by the body. The bacteria involved are the same bacteria that are always present on the skin. Regular cleansing of the skin can reduce, but not prevent, acne for a particular individual and very little variation among individuals is due to hygiene. Anything beyond very gentle cleansing can actually worsen existing lesions and even encourage new ones by damaging or overdrying skin.

• About Acne
• Causes of Acne
• Acne Treatments
• Acne Scars
• Microdermabrasion

• Dermatology
• List of Dermatological Diseases
• Dermasurgery

See also:
Pimple
Blackhead
Bacne
comedo
• adult acne

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Acne vulgaris".