If you have a child with psoriasis, will your other children also develop it? Where in the world does psoriasis most commonly occur? How common is psoriasis? Read on to find out.
At what age is psoriasis most likely to first appear?
There are two peak periods when psoriasis tends to appear for the first time:
16 to 22 years and 57 to 60 years. Between 10% and 15% of new cases start in
children less than 10 years old.
Where in the world is psoriasis most common?
The incidence of psoriasis varies with race, geography, and environment. The
country with the highest known rate of psoriasis is Norway (4.8%). The rate
is 2.6% in the United States and is probably similar in Canada. In Newfoundland,
the incidence of psoriasis is as high as 3% of the population. Scandinavia and
Western Europe also have higher-than-average rates. People with lower-than-average
rates include Japanese, West Africans, and North Americans of African descent.
Psoriasis is extremely rare in the indigenous (native) peoples of North and
South America.
Does psoriasis affect females more than males?
No. Psoriasis affects an equal number of adult men and women. In children and
teens, plaque psoriasis affects a greater number of females, but this is just
because the condition develops earlier in females.
Will the siblings of a child with psoriasis also develop the condition?
Possibly. People with a family history of psoriasis tend to develop psoriasis
earlier than others. If a child develops psoriasis before the age of 15, the
brothers and sisters of that child have a 3-fold higher risk of getting psoriasis
themselves compared to brothers and sisters of people who first got psoriasis
after age 30.
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