Psoriasis

Psoriasis is a skin condition consisting of gray or silvery flaky patches
which are red and inflamed underneath when scratched. Commonly affected
areas include the scalp, elbows, knees, navel, and groin. Psoriasis is
thought to be 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.

Psoriatic skin cells reproduce at several times the normal rate and tend to
pile up on the surface, forming itchy patches or "plaques." Psoriasis tends
to be triggered by emotional stress or physical skin injury, but the biggest
factor appears to be heredity.

Psoriasis has no cure, but somewhat effective treatments include sunlight,
artificial UV light, steroids, coal tar, salicylic acid, and synthetic
Vitamin D analogues. Treatments for rheumatoid arthritis, such as
methotrexate, have been observed to provide relief from psoriasis.

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