A B C D E F G H I J K L M N O P Q R S T U V W X Y Z view all
print format  

Pityriasis Rosea

What is pityriasis rosea?

Pityriasis rosea (say: pit-ih-rye-ah-sis row-see-ah) is a scaly, reddish-pink skin rash. It is most common in children and young adults, and usually occurs in spring and fall.

If you get this skin condition, you may feel like you have a cold at first. Then, a single scaly red spot may appear on your back or stomach. This is called a "herald patch." Smaller spots will develop on your body days to weeks later. These spots may itch badly. If the rash is on your back, it may have the shape of a Christmas tree.

What causes pityriasis rosea?

The cause of pityriasis rosea is uncertain. Some doctors believe that pityriasis rosea is caused by a viral or bacterial infection. Certain medicines also can cause this rash. Pityriasis rosea is not contagious, so people with this rash do not have to be kept away from other people.

What conditions look like pityriasis rosea?

The rash of pityriasis rosea can look like eczema, ringworm or psoriasis. Infection with syphilis also can cause a similar rash. If your doctor thinks you might have syphilis, he or she will order a blood test to find out.

How long does pityriasis rosea last?

Pityriasis rosea usually lasts 1 to 3 months and usually never comes back. Let your doctor know if the rash or itching lasts longer than 3 months.

Source

Written by familydoctor.org editorial staff.

Pityriasis Rosea by DL Stulberg, M.D., and J Wolfrey, M.D. (American Family Physician January 1, 2004, http://www.aafp.org/afp/20040101/87.html)

Reviewed/Updated: 12/06
Created: 11/04