Psoriasis is caused when the immune system mistakes normal skin cells for pathogens and reacts by creating an overproduction of skin cells. "Psoriasis is the most prevalent autoimmune disease in America," says Moore. "There is no cure for psoriasis and it is a life long condition that flares up and calms down due to stress and environmental factors."

Total direct and indirect health care costs of psoriasis for patients are calculated at $11.25 billion annually, with work loss accounting for 40 percent of the cost burden, according to the National Psoriasis Foundation. Approximately 60 percent of psoriasis patients missed an average of 26 days of work a year due to their illness.

"Psoriasis is much more than a cosmetic concern; it is often painful, difficult to heal and can be disfiguring," says Moore, who has practiced dermatology for more than 20 years in the Chicago area.

Dr. Moore has the following facts about psoriasis to share:

• Sufferers of psoriasis cannot tolerate "live" vaccines such as the nasal flu vaccine and the shingles shot. Patients with psoriasis should always consult their physician or dermatologist before getting vaccinated.

• Psoriasis can occur anywhere on the body from the scalp to the bottoms of the feet and even under fingernails and toenails.

• Psoriasis is often the most stubborn on hands and feet. One of Dr. Moore's most troublesome cases was an older gentleman. "He had severe psoriasis on his thumb and the top of his index finger, exacerbated by regular use of a lighter when igniting his pipe," said Moore. "Hands and feet are in constant use and subject to friction from movement which aggravates already sensitive skin."

• "Although it is natural to want to "pick" off the scaling or rough patches caused by psoriasis, this is actually one of the worst things you can do," says Moore. "There are many creams that are excellent at dissolving "crusting" and promoting healing."

• Contrary to popular belief, psoriasis does not always itch or even produce symptoms such as the telltale rash.

"Psoriasis has a strong genetic link and if both parents have it, the child has a 50 per cent chance of having it," says Moore. "If one parent has it, the child has a 10 percent chance of having psoriasis."

In addition to sunlight, treatment includes medication, creams and artificial light exposure.

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Materials provided by Loyola University Health System. Note: Content may be edited for style and length.