Pityriasis rosea is a rash that usually begins as a large circular or oval spot on your chest, abdomen or back. Called a herald patch, this spot can be up to 4 inches (10 centimeters) across.
The herald patch is typically followed by smaller spots that sweep out from the middle of your body in a shape that resembles drooping pine-tree branches.
Pityriasis (pit-ih-RIE-uh-sis) rosea can affect any age group. It most commonly occurs between the ages of 10 and 35. It usually goes away on its own within 10 weeks. Pityriasis rosea can cause itching. Treatment may help relieve the symptoms.
July 02, 2015
- Pityriasis rosea. Merck Manual Professional Version. http://www.merckmanuals.com/professional/dermatologic_disorders/psoriasis_and_scaling_diseases/pityriasis_rosea. Accessed April 29, 2015.
- Goldstein AO, et al. Pityriasis rosea. http://www.uptodate.com/home. Accessed April 29, 2015.
- Habif TP. Psoriasis and other papulosquamous diseases. In: Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Maryland Heights, Mo.: Mosby Elsevier; 2010. http://www.clinicalkey.com. Accessed April 28, 2015.
- Kliegman RM, et al. Diseases of the epidermis. In: Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.clinicalkey.com. Accessed April 23, 2012.
- AskMayoExpert. Pityriasis rosea. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
- Pityriasis rosea. American Academy of Dermatology. https://www.aad.org. Accessed April 28, 2015.
- Honigsmann H. UVB therapy (broadband and narrowband). http://www.uptodate.com/home. Accessed April 29, 2015.