A harmless rash that starts with one large oval patch, then spreads as smaller pink patches and settles on its own.
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At a glance
- Who it affects
- Often children, teenagers or young adults with a short-lived rash.
- What you notice
- One larger oval patch followed by smaller pink patches.
- What helps
- Often settles without treatment; comfort care may be discussed.
What we do
Your doctor may confirm the pattern and check for alternatives. Symptoms often settle, but timing varies.
What you can do
- Use gentle skin care.
- Avoid scratching.
- Ask if the rash changes or lasts longer.
Read the full page on Pityriasis rosea
What it is
Pityriasis rosea is a rash occurring on the skin which can last for several weeks. It usually occurs in children and young adults. It often begins as a single large scaly oval patch on the chest or back, called the herald or mother patch. Within a week or two, multiple pink oval patches appear on the body, arms, thighs and sometimes on the neck. These spots are smaller than the herald patch, and over the back they often form a pattern resembling the outline of an evergreen tree with drooping branches. The rash causes no symptoms, or mild itching.
What causes it
The cause is unknown. It is not caused by a fungal or bacterial infection. It is neither an allergic reaction nor a sign of any internal disease. A virus has been suggested, based on the fact that the disease occurs only once, starts suddenly and often settles by itself, but this theory has not been proven. It does not spread from person to person.
How we treat it
Pityriasis rosea is a self-limiting disorder, but it may take as long as six to eight weeks — nearly two months — to settle, so you need a lot of patience. Your dermatologist may prescribe soothing lotions, emollients and antihistamines for the itching. Topical steroids may be required. Ultraviolet light treatment under supervision may be helpful.
What you can do
You can continue all normal activities, including going to school or work. You can bathe, use soap and eat a normal diet.
“Be reassured that it is a common and harmless disorder.” — Dr. D. A. Satish, patient leaflet
Reviewed by Dr. D. A. Satish · date to be confirmed
The information on this website is for general education only. It is not a substitute for a consultation, a diagnosis or a prescription. Always see a qualified doctor about your own condition.