Psoriasis in the tropics. Epidemiologic, genetic, clinical, and therapeutic aspects.

There is a dearth of information on psoriasis in the tropics. Psoriasis occurs more frequently in northern geographic regions than in tropical climates. Its prevalence varies not only within the ethnic groups of a country but from country to country. A review of published studies on the natural history of psoriasis in the tropics is presented in this article.