Pityriasis rosea (say "pit-uh-RY-uh-sus ROH-zee-uh") is a common skin rash. It usually starts as one scaly and pinkish, purple, or red-brown patch on your stomach or back. Days or weeks later, more small patches appear. The rash may itch, but it will not spread to other people. Experts aren't sure what causes pityriasis rosea. Seborrhoeic dermatitis is a common, chronic, or relapsing form of eczema /dermatitis that mainly affects the sebaceous gland -rich regions of the scalp, face, and trunk. There are infantile and adult forms of seborrhoeic dermatitis. This benign inflammatory condition is sometimes associated with psoriasis and is known as sebopsoriasis. Pityriasis versicolor is a common skin condition caused by a fungus called Malassezia furfur. It causes patches of discolored skin that may be scaly or itchy. Learn more about the symptoms, diagnosis, and treatment of this condition in this book chapter from the National Center for Biotechnology Information.
Ringworm is a common cause of circular rash; however, many other skin conditions can present similarly. Other rashes that can present with red circles on the skin but are not ringworm include psoriasis, pityriasis rosea, Lyme disease, nummular eczema, contact dermatitis, hives, granuloma annulare, and lupus.

Pityriasis rosea is a common self-limiting rash that usually starts with a herald patch on the trunk and progresses along the Langer lines to a generalized rash over the trunk and limbs. The diagnosis is based on clinical and physical examination findings. The herald patch is an erythematous lesion with an elevated border and depressed center.

Overview. Pityriasis rosea is a rash that often begins as an oval spot on the face, chest, abdomen or back. This is called a herald patch and may be up to 4 inches (10 centimeters) across. Then you may get smaller spots that sweep out from the middle of the body in a shape that looks like drooping pine-tree branches.

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how common is pityriasis rosea