Prevalence and Incidence of Adult Acne
Adult Acne Prevalence: Book Excerpts
Prevalence/Incidence of Adult Acne: Online Medical Books
16 MEDICAL BOOKS ONLINE!
Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Adult Acne.
Acne vulgaris:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The cause of acne is multifactorial, but theories regarding dietary influences appear to be groundless. Predisposing factors include heredity; hormonal contraceptives (many females experience an acne flare-up during their first few menstrual cycles after starting or discontinuing hormonal contraceptives); androgen stimulation; certain drugs, including corticosteroids, corticotropin, androgens, iodides, bromides, trimethadione, phenytoin, isoniazid, lithium, and halothane; cobalt irradiation; and hyperalimentation. Other possible factors are exposure to heavy oils, greases, or tars; trauma or rubbing from tight clothing; cosmetics; emotional stress; and unfavorable climate.
More is known about the pathogenesis of acne. (See What happens in acne.) Androgens stimulate sebaceous gland growth and production of sebum, which is secreted into dilated hair follicles that contain bacteria. The bacteria, usually Propionibacterium acnes and Staphylococcus epidermidis (which are normal skin flora), secrete lipase. This enzyme interacts with sebum to produce free fatty acids, which provoke inflammation. Also, the hair follicles produce more keratin, which joins with the sebum to form a plug in the dilated follicle.
Acne vulgaris primarily affects adolescents (usually between ages 15 and 18), although lesions can appear as early as age 8. Although acne strikes boys more often and more severely than girls, it usually occurs in girls at an earlier age and tends to last longer, sometimes into adulthood.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
Acne:
Acne - epidemiology
(The 5-Minute Pediatric Consult)
Acne - prevalence
- Most common skin disorder in US
- More common in men during adolescence, and women during adulthood
- 85–100% of US teens have comedones
» READ BOOK EXCERPT ONLINE »
Source: The 5-Minute Pediatric Consult, 2008
About prevalence and incidence statistics:
The term 'prevalence' of Adult Acne usually refers to the estimated population
of people who are managing Adult Acne at any given time.
The term 'incidence' of Adult Acne refers to the annual diagnosis rate,
or the number of new cases of Adult Acne diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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