All statistics for Rosacea
Prevalence/Incidence of Rosacea: Online Medical Books
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Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Rosacea.
Rosacea:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Although the cause of rosacea is unknown, stress, infection, vitamin deficiency, menopause, and endocrine abnormalities can aggravate this condition. Anything that produces flushing — for example, hot beverages, such as tea or coffee; tobacco; alcohol; spicy foods; physical activity; sunlight; and extreme heat or cold — can also aggravate rosacea.
Rosacea is most common in white women between ages 30 and 50. When it occurs in men, however, it’s usually more severe and often associated with rhinophyma, which is characterized by dilated follicles and thickened, bulbous skin on the nose.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
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.
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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
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Source: The 5-Minute Pediatric Consult, 2008
About prevalence and incidence statistics:
The term 'prevalence' of Rosacea usually refers to the estimated population
of people who are managing Rosacea at any given time.
The term 'incidence' of Rosacea refers to the annual diagnosis rate,
or the number of new cases of Rosacea 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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