Contact dermatitis

Encyclopedia of Alternative Medicine by Mai Tran

Definition

Contact dermatitis is the name given to any skin inflammation that results from surface contact. There are two kinds of contact dermatitis, irritant and allergic.

Description

Thousands of natural and synthetic substances can cause contact dermatitis, which is the most common skin condition requiring medical attention, and the foremost source of work-related disease. Florists, domestic workers, hairdressers, food preparers, and employees in heavy industry, construction, carpentry, dry cleaning, farming, health care, and the military are the people most at risk of contracting work-related contact dermatitis. Americans spend roughly $300 million a year in their quest for relief from contact dermatitis, not counting the considerable sums devoted by governments and businesses to regulating and policing the use of skin-threatening chemicals in the workplace. But exactly how many people suffer from contact dermatitis remains unclear; a 1997 article in the Journal of the American Medical Association notes that figures ranging from 1-15% have been put forward for Western industrial nations.

Causes & symptoms

Irritant contact dermatitis (ICD) is the more commonly reported of the two types of contact dermatitis, accounting for about 80% of cases. It can be caused by soaps, detergents, solvents, adhesives, fiberglass, and other substances that are able to directly injure the skin. Most attacks are mild and confined to the hands and forearms, but can affect any part of the body that comes in contact with the irritating substance. The symptoms can take many forms: redness, itching, crusting, swelling, blistering, oozing, dryness, scaliness, thickening of the skin, and a feeling of warmth at the site of contact. In extreme cases severe blistering can occur and open sores can form. Occupations that require frequent skin exposure to water, such as hairdressing and food preparation, can make the skin more susceptible to ICD.

Allergic contact dermatitis (ACD) results when repeated exposure to an allergen (an allergy-causing substance) triggers an immune response that inflames the skin. Tens of thousands of drugs, pesticides, cosmetics, food additives, commercial chemicals, and other substances have been identified as potential allergens. Fewer than 30, however, are responsible the majority of ACD cases. Common culprits include poison ivy, poison oak, and poison sumac; fragrances and preservatives in cosmetics and personal care products; latex items, including gloves and condoms; and formaldehyde. Many people find that they are allergic to the nickel in inexpensive costume jewelry. ACD is usually confined to the area of skin that comes in contact with the allergen, typically the hands or face. Symptoms range from mild to severe and resemble those of ICD. A patch test may be needed to determine which kind of contact dermatitis a person is suffering from.

Diagnosis

Diagnosis begins with a physical examination and asking the patient questions about his or her health and daily activities. When contact dermatitis is suspected, the doctor attempts to learn as much as possible about the patient's hobbies, workplace duties, use of medications and cosmetics, etc.--anything that might shed light on the source of the disease. In some cases an examination of the home or workplace is undertaken. If the dermatitis is mild, responds well to treatment, and does not recur, ordinarily the investigation is at an end. More difficult cases require patch testing to identify the specific allergen.

Two methods of patch testing are currently used. The most widely used method, the Finn chamber method, employs a multiwell aluminum patch. Each well is filled with a small amount of the allergen being tested and the patch is taped to normal skin on the patient's upper back. After 48 hours the patch is removed and an initial reading is taken. A second reading is made a few days later. The second method of patch testing involves applying a small amount of the test substance directly to normal skin and covering it with a dressing that keeps air out and keeps the test substance in (occlusive dressing). After 48 hours the dressing is taken off to see if a reaction has occurred. Identifying the allergen may require repeated testing, can take weeks or months, and is not always successful. Moreover, patch testing works only with ACD, though it is considered an essential step in ruling out ICD.

Treatment

Herbal therapy

Herbal remedies have been used for centuries to treat skin disorders, including contact dermatitis. An experienced herbalist or naturopathic doctor can recommend the remedies that will be most effective for a person's condition. Among the herbs often recommended are:

• Burdock (Arctium lappa). Burdock is taken internally as a tea or tincture.
• Calendula (Calendula officinalis). Calendula is a natural antiseptic and anti-inflammatory agent. It is applied topically in a lotion, ointment, or oil to the affected area.
• Aloe (Aloe barbadensis). Aloes soothes skin irritations. Its gel is applied topically to the affected area.

Poison ivy, poison oak, and poison sumac are common culprits in cases of allergic contact dermatitis. Following exposure to these plants, the development of the characteristic rash may be prevented by washing the area with soap and water within 15 minutes of exposure. The leaves of jewelweed (Impatiens spp.), which often grows near poison ivy, may neutralize the poison ivy allergen if rubbed on the skin right after contact. Several topical herbal remedies may help relieve the itching associated with allergic contact dermatitis, including the juice of plantain leaves (Plantago major); a paste made of equal parts of green clay and goldenseal root (Hydrastis canadensis); a paste made of salt, water, clay, and peppermint (Mentha piperita) oil; and calamine lotion.