Psoriasis is a skin condition producing red scaling elevated plaques commonly on the elbows and knees. It may be more extensive or even universal (psoriatic erythroderma). The fingernails and toenails are often affected (psoriatic nail dystrophy). Some patients develop psoriatic arthritis, particularly involving the fingers ("sausage fingers") or spine. About 2-3% of the population suffers from this disease which is genetic in etiology. It is non-contagious, aggravated by stress (physical or emotional), may produce depression and loss of self-esteem, affects all ages, affects the sexes equally and is a challenge to treat.
Types of :
Plaque psoriasis
Skin lesions are red at the base and covered by silvery scales.
Also known as Classic Psoriasis or Psoriasis Vulgaris. The most common form of psoriasis, affecting about 80-90% of people with the disease. People with plaque psoriasis have raised, red, inflamed areas of skin—called plaques—often on the scalp, knees, elbows, chest, or back. It is found mainly on the upper torso and can sometimes occur around the forehead. These inflamed plaques of skin are covered by a silvery-white buildup called scale. It will often reoccur and its cause is not fully understood, although it is generally considered to be an autoimmune disease.
Pustular psoriasis
Blisters of noninfectious pus appear on the skin. Attacks of pustular psoriasis may be triggered by medications, infections, stress, or exposure to certain chemicals.
Guttate psoriasis
Small, teardrop shaped lesions appear on the trunk, limbs, and scalp. Guttate psoriasis is most often triggered by upper respiratory infections (for example, a sore throat caused by streptococcal bacteria).
The second most common form of psoriasis, characterized by small, pink or red drops on the skin. This type of psoriasis may cover a large portion of the body and is usually found on the chest, back, arms, or legs. It appears after a bacterial infection such as strep throat, especially in younger patients. Some cases go away without treatment in a few weeks, while many cases are more persistent and require treatment.
Psoriatic arthritis
Joint and connective tissue inflammation that produces symptoms of arthritis in patients who have or will develop psoriasis.
Inverse psoriasis (or "Flexural psoriasis"
Smooth, red patches occur in the folds of the skin near the genitals, under the breasts, or in the armpits. The symptoms may be worsened by friction, sweating and/or the presence of yeast or fungal infections. It is called inverse psoriasis because it occurs in moist areas, areas that aren't normally affected by classic psoriasis.
Erythrodermic psoriasis
Widespread reddening and exfoliation of the skin that may form the initial outbreak of psoriasis, but is more often the result of exacerbation of unstable plaque psoriasis, particularly under the triggering effect of: abrupt withdrawal of systemic treatment, use of systemic steroids or excessive use of high potency topical steroids corticosteroids (cortisone) or in a koebner response to a widespread allergic reaction or severe sunburn. This form of psoriasis can be genuinely dangerous, since the extreme inflammation and exfoliation interfere with the body's ability to regulate temperature and perform other barrier functions.
Effect on the quality of life
Depending on the severity and location of outbreaks, individuals may experience significant physical discomfort and some disability. Itching and pain can interfere with basic functions, such as self-care, walking, and sleep. Plaques on hands and feet can prevent individuals from working at certain occupations, playing some sports, and caring for family members or a home. The frequency of medical care is costly and can interfere with an employment or school schedule.
Individuals with psoriasis may also feel self-conscious about their appearance and have a poor self-image that stems from fear of public rejection and psychosexual concerns. Psychological distress can lead to significant depression and social isolation.
Causes
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. T cells help create scabs over wounds. 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. Epidermal cells then build up on the surface of the skin, forming itchy patches or plaques.
Most recently, the natural or innate immune system has been found to be highly implicated. Non-specific natural responses of the skin immune system, and virtually every subsystem of that, are activated in psoriasis.
The first outbreak of psoriasis is sometimes 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.
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 salt and beta blockers, which are prescribed for high blood pressure, may trigger an outbreak or worsen the disease. Other autoimmune diseases such as HIV/AIDS may significantly worsen the symptoms of psoriasis. Alcohol consumption and obesity may also worsen the condition.
Treatment
Specialist dermatologists generally treat psoriasis in steps based on the severity of the disease, size of the areas involved, type of psoriasis, and the patient's response to initial treatments. This is sometimes called the "1-2-3" approach. In step 1, medicines are applied to the skin (topical treatment). Step 2 uses ultraviolet light treatments (phototherapy). Step 3 involves taking medicines by mouth or injection that treat the whole immune system (called systemic therapy).
Over time, affected skin can become resistant to treatment, especially when topical corticosteroids are used. Also, a treatment that works very well in one person may have little effect in another. Thus, doctors often use a trial-and-error approach to find a treatment that works, and they may switch treatments periodically (for example, every 12 to 24 months) if a treatment does not work or if adverse reactions occur.
Topical treatment
Treatments applied directly to the skin may improve its condition. Doctors find that some patients respond well to ointment or cream forms of corticosteroids, vitamin D3, retinoids, coal tar, or anthralin. Bath solutions and moisturizers may be soothing, but they are seldom strong enough to improve the condition of the skin. Therefore, they usually are combined with stronger remedies.
Corticosteroids
These drugs reduce inflammation and the turnover of skin cells, and they suppress the immune system. Available in different strengths, topical corticosteroids (e.g., hydrocortisone) are usually applied to the skin twice a day. Short-term treatment is often effective in improving, but not completely eliminating, psoriasis. Long-term use or overuse of highly potent (strong) corticosteroids can cause thinning of the skin, internal side effects, and resistance to the treatment's benefits. If less than 10 percent of the skin is involved, some doctors will prescribe a high-potency corticosteroid ointment. High-potency corticosteroids may also be prescribed for plaques that don't improve with other treatment, particularly those on the hands or feet. In situations where the objective of treatment is comfort, medium-potency corticosteroids may be prescribed for the broader skin areas of the torso or limbs. Low-potency preparations are used on delicate skin areas. Cortisol (a.k.a. hydrocortisone) is an inexpensive corticosteroid available over the counter (without a prescription) in strengths that may be effective on very mild and emerging plaques. (Note: Brand names for the different strengths of corticosteroids are too numerous to list.)
Other side effects of corticosteroids are stretch marks in the skin, and rosacea that can affect the facial skin.
When using corticosteroids, it is important to follow the doctor's advice. Corticosteroids are very useful in the treatment of psoriasis, and used the correct way, side effects are seldom a problem. It is possible, however, for the condition to be aggravated on ceasing steroidal treatment, particulary after overuse. It is therefore essential that they are used in the correct way and instructions carefully followed.
Calcipotriol/Calcipotriene (Daivonex/Dovonex)
This drug is a synthetic form of vitamin D3 that can be applied to the skin. Applying calcipotriol/calcipotriene (for example, Daivonex/Dovonex) once to twice a day controls the speed of turnover of skin cells. It is sometimes combined with topical corticosteroids to reduce irritation. Daivonex is available as cream, ointment and scalp solution. Daivonex can cause skin irritation, worsening of the psoriasis and cause the onset of facial psoriasis amongst other side-effects. Daivonex should not be used on folds of skin, and should never be used on the face.Some countries require blood testing before and during use to monitor any changes in the levels of calcium in your blood. Hands should be washed thoroughly after use.
Combined calcipotriol/calcipotriene and cortisone (Daivobet/Dovobet)
Calcipotriol/Calcipotriene based ointments are usually not to be mixed with corticosteroids at the same time due to problems with the active substances interfering with each other. Lately a product has appeared that combines Betamethasone dipropionate, a steroid based product and calcipotriol/calcipotriene. This product is characterized by its rapid onset of action. The product is also more effective than the two products used separately. A third advantage with this product over most other products used to treat psoriasis is that its applied only once daily. Due to its rapid release of psoriasis symptoms it is suitable as an initial treatment.
Retinoids
Topical retinoids are synthetic forms of vitamin A. The retinoid tazarotene (Tazorac) is available as a gel or cream that is applied to the skin. If used alone, this preparation does not act as quickly as topical corticosteroids, but it does not cause thinning of the skin or other side effects associated with steroids. However, it can irritate the skin, particularly in skin folds and the normal skin surrounding a patch of psoriasis. It is less irritating and sometimes more effective when combined with a corticosteroid. Because of the risk of birth defects, women of childbearing age must take measures to prevent pregnancy when using tazarotene.
Coal tar
Preparations containing coal tar (gels and ointments) may be applied directly to the skin, added (as a liquid) to the bath, or used on the scalp as a shampoo. Coal tar products are available in different strengths, and many are sold over the counter (not requiring a prescription). It is less effective than corticosteroids and many other treatments and, therefore, is sometimes combined with ultraviolet B (UVB) phototherapy for a better result. Coal tar has an effect on some of the enzymes involved in psoriasis, and it increases the skin's sensitivity to light. The most potent form may irritate the skin, is messy, has a strong odor, and may stain the skin or clothing. Thus, it is not popular with many patients.
Anthralin
Anthralin reduces the increase in skin cells and inflammation. Doctors sometimes prescribe a 15- to 30-minute application of anthralin ointment, cream, or paste once each day to treat chronic psoriasis lesions. Afterward, anthralin must be washed off the skin to prevent irritation. This treatment often fails to adequately improve the skin, and it stains skin, bathtub, sink, and clothing brown or purple. In addition, the risk of skin irritation makes anthralin unsuitable for acute or actively inflamed eruptions.
Salicylic acid
This peeling agent, which is available in many forms such as ointments, creams, gels, and shampoos, can be applied to reduce scaling of the skin or scalp. Often, it is more effective when combined with topical corticosteroids, anthralin, or coal tar.
Clobetasol propionate
Clobetasol propionate is a corticosteroid available as ointment, cream, liniment, solution and foam. It is used to treat psoriasis on the body, and in the scalp. The foam penetrates the skin very well, is easy to use, and is not as messy as many other topical medications. Since clobetasol propionate is a superpotent corticosteroid, it should not be used for more than 14 days in a row. As with many medications of this potency, abruptly discontinuing it use may cause rebound effect.
Bath solutions
People with psoriasis may find that adding oil when bathing, then applying a moisturizer, soothes their skin. Also, individuals can remove scales and reduce itching by soaking for 15 minutes in water containing a coal tar solution, oiled oatmeal, Epsom salts, or Dead Sea salts.
Moisturizers
When applied regularly over a long period, moisturizers have a soothing effect. Preparations that are thick and greasy usually work best because they seal water in the skin, reducing scaling and itching.
Light therapy
Natural ultraviolet light from the sun and controlled delivery of artificial ultraviolet light are used in treating psoriasis.
Sunlight
Much of sunlight is composed of bands of different wavelengths of ultraviolet (UV) light. When absorbed into the skin, UV light suppresses the process leading to disease, causing activated T cells in the skin to die. This process reduces inflammation and slows the turnover of skin cells that causes scaling. Daily, short, nonburning exposure to sunlight clears or improves psoriasis in many people. Therefore, exposing affected skin to sunlight is one initial treatment for the disease.
Ultraviolet B (UVB) phototherapy
UVB is light with a short wavelength that is absorbed in the skin's epidermis. An artificial source can be used to treat mild and moderate psoriasis. Some physicians will start treating patients with UVB instead of topical agents. A UVB phototherapy, called broadband UVB, can be used for a few small lesions, to treat widespread psoriasis, or for lesions that resist topical treatment. This type of phototherapy is normally given in a doctor's office by using a light panel or light box. Some patients use UVB light boxes at home under a doctor's guidance.
A newer type of UVB, called narrowband UVB, emits the part of the ultraviolet light spectrum band that is most helpful for psoriasis. Narrowband UVB treatment is superior to broadband UVB, but it may be less effective than PUVA treatment (see next paragraph). It is gaining in popularity because it does help and is more convenient than PUVA. At first, patients may require several treatments of narrowband UVB spaced close together to improve their skin. Once the skin has shown improvement, a maintenance treatment once each week may be all that is necessary. However, narrowband UVB treatment is not without risk. It can cause more severe and longer lasting burns than broadband treatment.
Psoralen and ultraviolet A phototherapy (PUVA)
This treatment combines oral or topical administration of a medicine called psoralen with exposure to ultraviolet A (UVA) light. UVA has a long wavelength that penetrates deeper into the skin than UVB. Psoralen makes the skin more sensitive to this light. PUVA is normally used when more than 10 percent of the skin is affected or when the disease interferes with a person's occupation (for example, when a teacher's face or a salesperson's hands are involved). Compared with broadband UVB treatment, PUVA treatment taken two to three times a week clears psoriasis more consistently and in fewer treatments. However, it is associated with more short term side effects, including nausea, headache, fatigue, burning, and itching. Care must be taken to avoid sunlight after ingesting psoralen to avoid severe sunburns, and the eyes must be protected for one to two days with UVA-absorbing glasses. Long-term treatment is associated with an increased risk of squamous-cell and, possibly, melanoma skin cancers. Simultaneous use of drugs that suppress the immune system, such as cyclosporine, have little beneficial effect and increase the risk of cancer.
Computerized tunable targeted light systems
Newly developed tunable targeted multiwavelength system claim to supersede classical phototherapy. These systems use narrow band UVB targeted selectively to the psoriatic lesions through a fiber optic delivery system. Since by using these systems light targets only the psoriatic lesions there is no damage to surrounding normal skin. Since normal skin is not exposed, high intensity may be used allowing clearing of psoriatic plaques in 8-10 treatments instead of 30 to 40 treatments with the classical full body phototherapy units.
Light therapy combined with other therapies
Studies have shown that combining ultraviolet light treatment and a retinoid, like acitretin, adds to the effectiveness of UV light for psoriasis. For this reason, if patients are not responding to light therapy, retinoids may be added. UVB phototherapy, for example, may be combined with retinoids and other treatments. One combined therapy program, referred to as the Ingram regime, involves a coal tar bath, UVB phototherapy, and application of an anthralin-salicylic acid paste that is left on the skin for 6 to 24 hours. A similar regime, the Goeckerman treatment, combines coal tar ointment with UVB phototherapy. Also, PUVA can be combined with some oral medications (such as retinoids) to increase its effectiveness.
X-ray radiation
Stubborn psoriasis on the scalp can be treated with a form of X-ray radiation called Grenz ray. There is a limit to the number of treatments that can be given. Effect is said to be longer lasting than other treatments. This form of therapy is considered to have unacceptable risks and is no longer used in most countries.
Systemic treatment
For more severe forms of psoriasis, doctors sometimes prescribe medicines that are taken internally by pill or injection. This is called systemic treatment. Systemic therapy should be instituted under the careful guidance of a specialist dermatologist.
Methotrexate
Like cyclosporine, methotrexate slows cell turnover by suppressing the immune system. It can be taken by pill or injection. Patients taking methotrexate must be closely monitored because it can cause liver damage and/or decrease the production of oxygen-carrying red blood cells, infection-fighting white blood cells, and clot-enhancing platelets. As a precaution, doctors do not prescribe the drug for people who have had liver disease or anemia (an illness characterized by weakness or tiredness due to a reduction in the number or volume of red blood cells that carry oxygen to the tissues). It is sometimes combined with PUVA or UVB treatments. Methotrexate should not be used by pregnant women, or by women who are planning to get pregnant, because it may cause birth defects.
Retinoids
A retinoid, such as acitretin (Soriatane or Neotigason), is a compound with vitamin A-like properties that may be prescribed for severe cases of psoriasis that do not respond to other therapies. Because this treatment may also cause birth defects, women must protect themselves from pregnancy beginning 1 month before through 3 years after treatment with acitretin. Most patients experience a recurrence of psoriasis after these products are discontinued. Common side effects include dry lips, hands and feet. Use of retinoids in conjunction with UV treatments has been found to be very effective for some people.
Cyclosporine
Taken orally, cyclosporine acts by suppressing the immune system to slow the rapid turnover of skin cells. It may provide quick relief of symptoms, but the improvement stops when treatment is discontinued. The best candidates for this therapy are those with severe psoriasis who have not responded to, or cannot tolerate, other systemic therapies. Its rapid onset of action is helpful in avoiding hospitalisation of patients whose psoriasis is rapidly progressing. Cyclosporine may impair kidney function or cause high blood pressure (hypertension). Therefore, patients must be carefully monitored by a doctor. Also, cyclosporine is not recommended for patients who have a weak immune system or those who have had skin cancers as a result of PUVA treatments in the past. It should not be given with phototherapy.
6-Thioguanine
This drug is nearly as effective as methotrexate and cyclosporine. It has fewer side effects, but there is a greater likelihood of anemia. This drug must also be avoided by pregnant women and by women who are planning to become pregnant, because it may cause birth defects.
Hydroxyurea (Hydrea)
Compared with methotrexate and cyclosporine, hydroxyurea is somewhat more effective. It is sometimes combined with PUVA or UVB treatments. Possible side effects include anemia and a decrease in white blood cells and platelets. Like methotrexate and retinoids, hydroxyurea must be avoided by pregnant women or those who are planning to become pregnant, because it may cause birth defects. This is an extremely potent drug that was originally used to treat cancer patients in combination with chemotherapy.
Antibiotics
These medications are not indicated in routine treatment of psoriasis. However, antibiotics may be employed when an infection, such as that caused by the bacteria Streptococcus, triggers an outbreak of psoriasis, as in certain cases of guttate psoriasis.
Biologics
One of the newest classes of treatment for psoriasis are drugs collectively known as "biologics". These in general are types of manufactured proteins that attempt to impact the actual immune pathway of psoriasis, instead of affected skin cells. However, unlike other immunosuppression therapies such as Methotrexate, biologics try to narrowly focus on the one aspect of the immune function causing the psoriasis instead of broad immune system suppression. These drugs have only recently begun to receive approval by the FDA, and their long-term impact on immune function is currently unknown. Examples of biologics would be compounds such as Amevive®, etanercept (Enbrel®), Humira®, infliximab (Remicade®) and Raptiva.
Lifestyle
Unproven anecdotal evidence suggests that psoriasis can be effectively managed through a healthy lifestyle. Some sufferers have found that minimizing stress and consumption of alcohol, sugar and other "aggressive" foods, combined with rest, sunshine and swimming in saltwater keep lesions to a minimum. This type of "lifestyle" treatment is effective as a long-term management strategy, rather than initial treatment of severe cases. One sufferer describes his psoriasis as his "barometer" which lets him know when he is getting too stressed and not living "well." This positive attitude and proactive approach can be an effective part of, or short-term replacement for, medical solutions.
Some also cite anecdotal evidence that vegetarianism prevents outbreaks of psoriasis.