Vitiligo is more commonly known as leucoderma, which simply means white (leuco) skin (derma), i.e. a skin disorder where it loses its normal coloration. It is also medically known as achromia, which means loss of color.

Basically, Vitiligo can hardly be called as a disease but a skin- disorder that has more social than medical significance, especially amongst the dark skin people. Due to retarded melanin formation, there is loss of pigmentation.

The Vitiligo sufferers are observed all over the world, including the white skin communities. However, epidemiologically most cases are recorded in India (8.8%) and Mexico. Males and females are affected equally, inclusive of children age group. It may begin at any age. Childhood vitiligo is not uncommon.

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Psoriasis is a disease whose main symptom is gray or silvery flaky patches on the skin which are red and inflamed underneath. In the United States, it affects 2 to 2.6 percent of the population, or between 5.8 and 7.5 million people. Commonly affected areas include the scalp, elbows, knees, arms, stomach and back. Psoriasis is autoimmune in origin, and is not contagious. Around a quarter of people with psoriasis also suffer from psoriatic arthritis, which is similar to rheumatoid arthritis in its effects. Psoriasis was first given that name in complete differentiation from other skin conditions by the Austrian dermatologist Ferdinand von Hebra in 1841, although there are what are believed to be descriptions of the disease in sources going back to ancient Roman and possibly even biblical times.

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