Want more iVillage? Sign up for our
Newsletters
Pityriasis Rosea - Topic Overview
SYMPTOMS & TREATMENTS
What is pityriasis rosea?
Pityriasis rosea (say "pih-tih-RY-uh-sus ROH-zee-uh") is a common skin problem that causes a rash. Although it can occur at any age, it is seen most often in those between the ages of 10 and 35.
Pityriasis rosea is usually harmless. But it can cause serious problems in pregnant women.
See a picture of
pityriasis rosea 
.
What causes pityriasis rosea?
The cause of pityriasis rosea is unknown. Unlike many other skin conditions, it is not an allergic reaction or caused by a fungus or bacteria. Some experts think it may be caused by a virus. But neither signs of a virus (such as its genetic material) nor symptoms of a viral infection (such as a fever) are found in everyone with pityriasis rosea.
What are the symptoms?
Pityriasis rosea causes a rash.
- The rash often begins with a single, round or
oval, pink patch that is scaly with a raised border (herald patch). The size of
the patch ranges from
2 cm (0.8 in.) to
10 cm (3.9 in.). The larger
patches are more common. See a picture of a
herald patch .
- Days to weeks later, salmon-colored, 1 cm (0.4 in.) to 2 cm (0.8 in.) oval patches appear in batches on the abdomen, chest, back, arms, and legs. Patches sometimes spread to the neck but rarely to the face.
- Patches on the back are often vertical and angled to form a "Christmas tree" or "fir tree" appearance.
- The rash does not cause itching in 25% of people who have pityriasis rosea. For 50% of people, the itch is mild to moderate. And for 25% of people, the itch is severe.1
- The rash usually lasts 6 to 8 weeks, but it can last up to several months.
The rash may take other forms. Rounded bumps (papular rash) may be seen in young children, pregnant women, and people with dark skin. Blisters (vesicular rash) may be seen in infants and young children. In some people, the herald patch may not appear, or two herald patches may appear close together.
Before the herald patch appears, you may feel tired and as though you have a cold. You may have a headache, nausea, sore throat, and loss of appetite.
The pityriasis rosea rash is similar to the rash seen in other skin conditions, including ringworm of the skin, tinea versicolor, eczema, and psoriasis.
A rash similar to pityriasis rosea also can be caused by syphilis and by certain medicines such as antibiotics.
If you get a rash on the palms of your hands or the soles of your feet, see your doctor. This can be a sign of something more serious than pityriasis rosea.
How is pityriasis rosea diagnosed?
Your doctor will diagnose pityriasis rosea by looking at the rash. Diagnosis can be difficult when only the herald patch is visible, because the condition is often mistaken for ringworm or eczema at this time. After the rash appears, diagnosis is generally clear.
If the diagnosis is unclear, your doctor may do a potassium hydroxide (KOH) test to make sure the rash is not caused by a fungal infection. A skin sample may be taken from the infected area and examined under the microscope (biopsy). If the diagnosis is unclear in a sexually active person, a test for syphilis is often done.
How is it treated?
Pityriasis rosea will usually go away in 6 to 8 weeks without treatment. If the rash itches, you may wish to use skin lotions and lubricants to soothe itching. If symptoms are severe, anti-inflammatory medicines such as corticosteroids may be used to relieve itching and reduce the rash. Some people may try other medicines, such as antifungals, because the rash looks like ringworm. But because pityriasis rosea is not caused by a fungus, these medicines are not effective.
Exposing the rash to sunlight may make it go away more quickly. But exposing your skin to the sun too long can result in sunburn and increase your risk of skin cancer.
If the rash lasts more than 3 months, contact your doctor.
To relieve itching at home:
- Keep the itchy area cool and moist. Apply washcloths soaked in ice water. But remember that repeated wetting and drying will actually dry out your skin. Dry skin can make itching caused by a rash worse.
- Avoid taking hot showers or baths. Keep the water as cool as you can tolerate.
- Try an oatmeal bath, such as Aveeno Colloidal Oatmeal bath, to help relieve itching. You may also wrap 1 cup of oatmeal in a cotton cloth and boil as you would to cook oatmeal. Use this as a sponge and bathe in cool water without soap.
- Try an over-the-counter 1% hydrocortisone cream for small itchy areas. Use the cream very sparingly on the face or genitals. Note: Do not use the cream on children younger than age 2 unless your doctor tells you to. Do not use in the rectal or vaginal area in children younger than age 12 unless your doctor tells you to.
- Try an over-the-counter antihistamine, such as chlorpheniramine maleate (Chlor-Trimeton) or diphenhydramine (Benadryl). Don't give antihistamines to your child unless you've checked with the doctor first.
- Apply a moisturizer or calamine lotion to the skin while it is damp.
- Wear cotton or silk clothing. Avoid wearing wool and acrylic fabrics next to your skin.
- Use as little soap as possible. Use gentle soaps, such as Basis, Cetaphil, Dove, or Oil of Olay. Avoid deodorant soaps when you have a rash.
| By: | Healthwise Staff | Last Revised: February 24, 2010 |
| Medical Review: | Anne C. Poinier, MD - Internal Medicine Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology | |
© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.
Welcome to Care Circle, an exclusive tool to help you take care of yourself and your loved ones. Here's how it works:
- Create profiles for yourself and your loved ones.
- Select the topics and conditions that interest each of you.
- Get customized news updates, original content, tools, and expert advice for each Care Circle member delivered directly to your personalized homepage.
The information you input is strictly private; you choose who has access to your Care Circle.
How do I add myself or someone else to my care circle?
Click on "Add someone." Fill out the short profile. Choose an avatar. Select the topics and conditions that interest this person from the pulldown menu. You can select as many as you want, but you must choose at least one. Click on "Add Someone" again. You should start getting updates immediately.
How do I save content to my Care Circle?
Click on "Manage My Care Circle." Select the tab of the person for whom you're saving content. Put your cursor over the piece of content that you want to save; a disk icon will appear in the righthand corner. Click on the disk and the piece of content will be moved to a save folder.
How do I add additional topics and conditions for someone in my Care Circle?
Click on "Manage My Care Circle." Select the tab for the person whose preferences you'd like to update. Under "Add More to Follow," select additional topics and conditions.
How do I delete topics and conditions for someone in my Care Circle?
Click on "Manage My Care Circle." Select the tab for the person whose preferences you'd like to update. Under "Follows," scroll over the topic or condition you want to delete. An "X" should appear on the righthand side. Click on the "X" and the topic or condition will be deleted from the list.
To manage your Care Circle, Please
Sign In.
from
- Facebook is now fueling organ donations
- Military women and suicide: Home safe but not sound
- Still in gear: Injuries don’t stop veterans on 100-day bike trek
- Ask Jenna: I've hit a weight loss plateau. What do I do?
- He poses in a tutu to laugh in face of wife's cancer
- After chemo hair loss, 'henna crowns' help heal
The iVillage Network