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Polymorphous light eruption, also known as polymorphic light eruption, is a rash caused by sun exposure in people who have developed sensitivity to sunlight. The rash usually appears as red, tiny bumps or slightly raised patches of skin.
Polymorphous light eruption occurs most often during spring and early summer when a person's exposure to sunlight increases. Repeat episodes are less likely as the summer progresses. But the rash often recurs each year after the first incident.
Polymorphous light eruption usually goes away on its own without scarring within 10 days. People with severe or persistent rashes may need treatment with medication.
The term "eruption" refers to the rash, which usually appears 30 minutes to several hours after exposure to sunlight. The rash typically appears on areas of the body that tend to be covered during winter but exposed in summer: the upper chest, front of the neck and arms.
Characteristics of the rash may include:
Dense clusters of small bumps and blisters
Red, raised rough patches
Itching or burning
Rarely people may have other signs or symptoms, such as fever, chills, headache or nausea. These conditions may be the result of an associated sunburn rather than polymorphous light eruption.
When to see a doctor
See your doctor if you have any rash with no obvious cause, such as a known allergy or recent contact with poison ivy.
Polymorphous light eruption rashes look similar to rashes caused by other diseases, some of which are serious. So it's important to get a prompt diagnosis and appropriate treatment.
Seek immediate medical care if your rash is:
Accompanied by fever
The exact cause of polymorphous light eruption isn't well-understood. The rash appears in people who have developed sensitivity to components of sunlight, and in particular ultraviolet (UV) radiation from the sun or other sources, such as tanning beds or tanning lamps. This sensitivity is called photosensitivity. It results in immune system activity that causes a rash.
UV radiation is a wavelength of sunlight in a range too short for the human eye to see. UV light that reaches the earth is divided into two wavelength bands — ultraviolet A (UVA) and ultraviolet B (UVB).
A person with photosensitivity can react to both types of UV radiation. Although UVB doesn't penetrate glass, UVA does. UVA may even penetrate through most sunscreens. So exposure to sunlight through windows or even sunscreen-protected skin may cause a reaction in some people with photosensitivity.
Sensitivity to sunlight lessens with repeated exposure in polymorphous light eruption. Features of polymorphous light eruption are somewhat predictable:
An episode is most likely to occur after the first one or two exposures to sunlight after a long period of no exposure. This usually means that an episode occurs during the spring or early summer or during a winter vacation in a sunnier location.
Episodes are less likely to occur as the summer progresses.
After the first episode of polymorphous light eruption, additional episodes are likely to recur each spring or early summer.
Some people gradually become less sensitive over several years and eventually no longer experience the annual rash.
Anyone can develop polymorphous light eruption, but several factors are associated with an increased risk of the condition:
Experiencing the first episode during the teenage years or 20s
Having light skin and living in northern regions
Having a family history of the condition
Your doctor can probably make a diagnosis of polymorphous light eruption based on a physical exam and your answers to questions. He or she may also have you undergo laboratory tests in order to confirm a diagnosis or rule out other conditions. Tests may include:
Skin biopsy. Your doctor may remove a sample of rash tissue (biopsy) for examination in a lab.
Blood tests. A nurse or assistant may draw blood for laboratory tests.
Phototesting. Your doctor may refer you to a specialist in skin conditions (dermatologist) for phototesting. During the test small areas of your skin are exposed to measured amounts of UVA and UVB light to try to reproduce the problem. If your skin reacts to the UV radiation, you're considered sensitive to sunlight (photosensitive) and may have polymorphous light eruption or another light-induced disorder.
Other light-induced conditions
Your doctor may need to rule out other disorders characterized by light-induced skin reactions. These conditions include:
Chemical photosensitivity. A number of chemicals — drugs, medicated lotions, fragrances, plant products — can induce photosensitivity. When this occurs, your skin reacts each time it's exposed to sunlight after ingesting or coming into contact with a particular chemical.
Solar urticaria. Solar urticaria is a sun-induced allergic reaction that produces hives — raised, red, itchy welts that appear and disappear on your skin. The welts can appear within a few minutes of sun exposure and last for a few minutes to hours. Solar urticaria is a chronic condition that can last for years.
Lupus rash. Lupus is an inflammatory disorder that affects a number of body systems. One symptom is the appearance of a discolored, bumpy rash on areas of skin exposed to sunlight, such as the face, neck or upper chest.
Treatment of polymorphous light eruption usually isn't necessary because the rash typically goes away on its own within 10 days. If your symptoms are severe, your doctor may prescribe anti-itch medicine (a corticosteroid cream or pill). Treatment is also available to help prevent a rash.
Your doctor may suggest phototherapy to prevent seasonal episodes of polymorphous light eruption in people who have experienced disabling signs and symptoms. Phototherapy exposes your skin to small doses of UVA or UVB light, which helps your skin be less sensitive to light. Basically, it's a controlled version of the increased exposure you would experience over the course of the summer.
One type of light therapy called psoralen plus ultraviolet A (PUVA) combines UVA with a medicine called psoralen, which makes the skin more sensitive to this light. Short-term side effects of this therapy may include nausea, headache and itching.
Lifestyle and home remedies
Self-care measures that may help ease your signs and symptoms include:
Applying anti-itch cream. Try an over-the-counter (nonprescription) anti-itch cream, which may include products containing at least 1 percent hydrocortisone.
Taking antihistamines. If itching is a problem, oral antihistamines may help.
Using cold compresses. Apply a towel dampened with cool tap water to the affected skin, or take a cool bath.
Leaving blisters alone. To speed healing and avoid infection, leave blisters intact. If needed, you can lightly cover blisters with gauze.
Taking a pain reliever. An over-the-counter pain medication may help reduce redness or pain. These include ibuprofen (Advil, Motrin IB, others), acetaminophen (Tylenol, others) and naproxen sodium (Aleve, others).
To lessen the likelihood of recurring episodes of polymorphous light eruption, take the following precautions:
Avoid the sun between 10 a.m. and 2 p.m. Because the sun's rays are most intense during this time, try to schedule outdoor activities for other times of the day.
Use sunscreen. Fifteen to 30 minutes before going outdoors, apply a broad-spectrum sunscreen, one that provides protection from both UVA and UVB light. Use a sunscreen with a sun protection factor (SPF) of at least 30. Apply sunscreen generously, and reapply every two hours — or more often if you're swimming or perspiring. If you're using a spray sunscreen, be sure to cover the entire area completely. Cover up. For protection from the sun, wear tightly woven clothing that covers your arms and legs and a broad-brimmed hat, which provides more protection than does a baseball cap or golf visor.
Consider wearing clothing designed to provide sun protection. Look for clothes labeled with an ultraviolet protection factor (UPF) of 40 to 50. Follow care instructions on the label of UV-blocking clothes to maintain their protective feature.
Preparing for an appointment
You're likely to start by seeing your primary care doctor. He or she may refer you to a specialist in skin diseases (dermatologist).
Here's some information to help you get ready for your appointment.
What you can do
Be aware of any pre-appointment restrictions. At the time you make the appointment, be sure to ask if you need to do anything in advance.
List any symptoms you're experiencing, including any that may seem unrelated to the reason for which you scheduled the appointment.
List key personal information, including any major stresses or recent life changes.
List all medications, vitamins or supplements that you're taking, including doses.
List questions to ask your doctor.
For polymorphous light eruption, some basic questions to ask your doctor include:
What's the most likely cause of my symptoms?
What tests do I need? Do they require any special preparation?
Is this condition temporary or long lasting?
Is it possible this condition is related to a more serious illness?
What treatments are available, and which do you recommend?
What side effects can I expect from treatment?
Do I need to follow any restrictions?
Is there a generic alternative to the medicine you're prescribing me?
Do you have any brochures or other printed material I can take with me? What websites do you recommend?
What to expect from your doctor
Your doctor will ask you a number of questions about your symptoms and your medical history, such as:
When did the rash appear?
Does it itch or cause pain?
Have you had a fever associated with the rash?
Do you have any other symptoms?
Did you recently start a new medication?
Have you recently used a cosmetic or fragrance in the area of the rash?
Have you had a similar rash before? When?
Has the duration of your sunlight exposure increased recently?
Have you recently used a tanning bed or lamp?
Do you use sunscreen?
What you can do in the meantime
Avoid sun exposure whenever possible. If you can't avoid the sun, use a broad-spectrum sunscreen with an SPF of at least 30 in areas that cannot be protected by clothing. Apply it generously 15 minutes before sun exposure. Reapply it every two hours or more often if you're swimming or sweating. This won't totally protect you from a reaction, as ultraviolet A may penetrate through most sunscreens.