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All about psoriasis types of psoriasis causes of psoriasis diagnosis of psoriasis psoriasis triggers symptoms of psoriasis psoriasis risk factors treatment for psoriasis topical treatment for psoriasis phototherapy treatment for psoriasis systemic treatment for psoriasis plaque psoriasis guttate psoriasis flexural psoriasis pustular psoriasis erythrodermic psoriasis scalp psoriasis

What causes psoriasis?

Psoriasis is driven by the immune system, especially involving a type of white blood cell called a T cell. Normally, T cells help protect the body against infection and disease. In the case of psoriasis, T cells are put into action by mistake and become so active that they trigger other immune responses, which lead to inflammation and to rapid turnover of skin cells. These cells pile up on the surface of the skin, forming itchy patches or plaques. The first outbreak of psoriasis is often

triggered by emotional or mental stress or physical skin injury, but heredity is a major factor as well. In about one-third of the cases, there is a family history of psoriasis. Researchers have studied a large number of families affected by psoriasis and identified genes linked to the disease. (Genes govern every bodily function and determine the inherited traits passed from parent to child.) People with psoriasis may notice that there are times when their skin worsens, then improves. Conditions that may cause flareups include infections, stress, and changes in climate that dry the skin. Also, certain medicines, including lithium and beta blockers, which are prescribed for high blood pressure, may trigger an outbreak or worsen the disease.

Normal skin has two layers: an outer layer called the epidermis and an inner layer called the dermis. Skin cells are created in the dermis and move up through the epidermis to the skin surface. Skin cells are continually dying and being replaced. Normally, skin cells mature and shed in about a month. In psoriasis, however, the normal cycle of replacing old skin cells with new ones becomes unbalanced. Skin cells reproduce many times faster than normal and live only three to four days. The dead cells build up on the skin, forming thick, flaky patches called plaques. The redness in skin plaques is caused by increased blood supply to the rapidly multiplying skin cells.

Psoriasis is the growth of too many skin cells — a normal skin cell matures in 28—30 days but a psoriatic skin cell takes only 3—6 days. The exact cause of this is not known. There may be a genetic link that is triggered by another factor — for example, a throat infection, stress or injury to the skin. There are certain times in life when the tendency to develop psoriasis is increased — for example, during puberty or in women during or after the menopause. However no obvious cause can be detected in the majority of people who develop psoriasis.

More information on psoriasis

What is psoriasis? - Psoriasis is a disease whose main symptom is gray or silvery flaky patches on the skin which are red and inflamed underneath when scratched.
What types of psoriasis are there? - Types of psoriasis include plaque psoriasis, guttate psoriasis, pustular psoriasis, erythrodermic psoriasis, flexural psoriasis, psoriatic arthritis, and nail psoriasis.
What causes psoriasis? - Psoriasis is driven by the immune system. Psoriasis is the growth of too many skin cells. The first outbreak of psoriasis is often triggered by emotional or mental stress or physical skin injury.
How is psoriasis diagnosed? - Physicians diagnose psoriasis by examining the affected skin. In people with psoriatic arthritis, the arthritis usually follows the appearance of psoriasis.
What triggers psoriasis? - Psoriasis triggers include streptococcal infection, sun exposure, drug reactions, hormonal factors, psychological factors, and skin trauma.
What are the psoriasis symptoms? - Symptoms depend on the type of psoriasis the individual has and may include bright red areas of raised patches (plaques) on the skin, tiny areas of bleeding, and itching.
What are the psoriasis risk factors? - The risks associated with developing psoriasis are similar to the triggers of the disease. The most significant risk factor for psoriasis is a family history of the condition.
What is the treatment for psoriasis? - The treatment is chosen on the basis of the pattern of psoriasis and its severity. Treatments for psoriasis can often control the disease for long periods.
What is the topical treatment for psoriasis? - Some patients with psoriasis respond well to ointment or cream forms of corticosteroids, vitamin D3, retinoids, coal tar, or anthralin. The medication that is best may depend on the type and location of the psoriasis.
What is the phototherapy treatment for psoriasis? - Phototherapy treatment for psoriasis uses ultraviolet (UV) light to kill T cells in skin, reducing redness and slowing the overproduction of skin cells that causes scaling.
What is the systemic treatment for psoriasis? - Systemic treatment for psoriasis involves taking medicines internally by pill or injection. Systemic psoriasis treatment drugs include methotrexate, retinoids, cyclosporine.
What is plaque psoriasis? - Plaque psoriasis can is a disease with very clearly defined area of skin which has a raised, red and inflamed section of skin covered in silvery scales.
What is guttate psoriasis? - Guttate psoriasis is a type of psoriasis that looks like small, salmon-pink drops on the skin. Guttate psoriasis is characterised by multiple tiny areas of psoriasis.
What is flexural psoriasis? - Flexural psoriasis is a form of psoriasis found in the armpits, groin, under the breasts and in other flexion creases (skin folds) such as those around the genitals and buttocks.
What is pustular psoriasis? - Pustular psoriasis is an uncommon form of psoriasis. People with pustular psoriasis have clearly defined, raised bumps on the skin that are filled with pus (pustules).
What is erythrodermic psoriasis? - Erythrodermic psoriasis is a particularly inflammatory form of psoriasis that often affects most of the body surface. Erythroderma is a generalised redness of the skin.
What is scalp psoriasis? - Scalp psoriasis range from very mild with fine scaling to very severe with thick, crusted plaques. Scalp psoriasis scales appear powdery with a silvery sheen. 
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All information is intended for reference only. Please consult your physician for accurate medical advices and treatment. Copyright 2005, health-cares.net, all rights reserved. Last update: July 18, 2005