When a mysterious rash appears on your chest or back, it's natural to feel concerned. One potential cause you may not have heard of is pityriasis rosea, a common, non-serious skin condition that often mimics other dermatologic issues. It typically starts as a single scaly patch before spreading into a larger, more noticeable rash that can look worse than it feels. Understanding the signs and knowing when to see a dermatologist is key to managing this condition and ruling out anything more serious.
At the Dermatology & Cutaneous Surgery Institute (DCSI), our board-certified dermatologists diagnose and treat a wide range of rashes, inflammatory conditions, and unusual skin changes with precision and care. We proudly serve Palm Beach County and the South Florida region with expert-level skin care in both our Wellington and Jupiter locations.
What Exactly Is Pityriasis Rosea?
Pityriasis rosea is a short-term skin condition characterized by the development of a large, isolated lesion called a herald patch rash, followed by smaller lesions that spread outward. It tends to affect teenagers and young adults, though people of any age can develop it. While the rash may be dramatic in appearance, it is not life-threatening and usually resolves on its own within a few weeks. According to the Mayo Clinic, the condition typically lasts between six to eight weeks and resolves without scarring or long-term damage.¹
Because pityriasis rosea often mimics conditions like eczema, psoriasis, or even early skin cancers, seeking a professional diagnosis ensures proper care. Learn more about the different types of skin rashes that may look similar to help understand what sets this condition apart.
If you’re seeing a skin rash on your chest or back, especially one that seems to grow or spread, it’s worth contacting a specialist.
Who Is at Risk for Pityriasis Rosea?
This condition most commonly affects adolescents and people between the ages of 10 and 35. The exact trigger isn’t fully understood, but it may be associated with certain viral infections. That said, it’s not considered highly contagious.
Though relatively rare, pityriasis rosea in children has been documented. There's also a variation known as pityriasis rosea of pregnancy, which tends to occur in the first trimester. In these cases, careful monitoring is advised to ensure no complications arise.
Our dermatologists can help distinguish between benign skin reactions and more serious concerns. If you're unsure whether a rash is normal, our medical dermatology services are designed to provide the answers you need.
What Causes Pityriasis Rosea?
If you’re wondering what causes pityriasis rosea, the answer is still being explored. It’s believed to be triggered by a viral infection, particularly human herpesvirus types 6 or 7 (HHV-6/HHV-7), which are also linked to other common childhood illnesses.² However, unlike traditional viruses, pityriasis rosea doesn’t spread easily from person to person and isn’t considered contagious under most circumstances.
Environmental or immune-related factors may also contribute to flare-ups, though more research is needed. What’s clear is that while the condition may look alarming, it's usually not harmful and will clear up on its own over time.
Signs and Symptoms to Watch For
The first sign of pityriasis rosea is often a single, round, or oval pink lesion, typically the size of a coin, that appears on the chest, stomach, or back. This herald patch rash may go unnoticed for a few days before smaller satellite lesions emerge in a symmetrical pattern. These lesions often follow the lines of the ribs, forming what’s commonly described as a “Christmas tree” layout on the back.¹
Common pityriasis rosea symptoms include:
- Mild to moderate itching
- Fatigue or flu-like symptoms (in rare cases)
- Rash that evolves and spreads
Though the rash is typically concentrated on the chest and back, it can also appear on the arms, thighs, and neck.
Our team regularly diagnoses rashes that are initially mistaken for other conditions. If your symptoms don’t align with pityriasis rosea or last longer than expected.
Is Pityriasis Rosea Contagious?
Many patients ask, “Is pityriasis rosea contagious?” The good news is no. It isn’t considered contagious in the traditional sense. Although there may be viral involvement, there is no strong evidence of transmission between individuals through skin contact or airborne exposure.² You can’t catch pityriasis rosea from someone else, and it doesn’t pose a public health concern.
Still, it’s important to confirm the diagnosis. Some contagious conditions, like fungal infections or bacterial rashes, can present similarly and may require treatment.
How Long Does It Last, and How Do You Treat It?
For most people, pityriasis rosea clears up in six to eight weeks, though it may last a bit longer in rare cases. If you’re wondering how long pityriasis rosea lasts, the answer varies based on the severity of the rash and your body’s immune response.
Most treatments focus on symptom relief rather than curing the condition. Common treatments for pityriasis rosea may include:
- Antihistamines or topical creams to reduce itching
- Mild corticosteroids to decrease inflammation
- Oatmeal baths and unscented moisturizers
- In some cases, light therapy (UVB phototherapy) is recommended if the rash is widespread and itchy
Patients in South Florida often benefit from a personalized care plan. If your rash is causing discomfort, our team can provide targeted solutions through our medical dermatology services.
Why a Diagnosis From a Dermatologist Matters
Even though pityriasis rosea is benign, self-diagnosing rashes can be risky. Skin conditions like eczema, psoriasis, and even some forms of skin cancer can resemble this harmless rash early on. A board-certified dermatologist can rule out serious concerns and help you feel confident about your skin health.
If you’re unsure about a skin issue, it’s best to have it evaluated in person. With offices conveniently located in Palm Beach County, our team offers comprehensive dermatology services in South Florida backed by years of clinical experience and diagnostic expertise.
Your Partner in Skin Health
At Dermatology & Cutaneous Surgery Institute (DCSI), we take pride in offering reliable dermatologic care backed by medical precision, patient education, and compassionate service. Our specialists are trusted by families across Wellington, Jupiter, and greater South Florida to manage both common and complex skin concerns.
Whether you’re dealing with a sudden rash or a chronic condition, we’re here to help. Contact Dr. Mounir M. Wassef and the DCSI team to take the first step toward healthier skin. Be sure to explore our dermatitis blog for more expert insights, treatment updates, and skincare education tailored to your needs.
Sources
- Mayo Clinic Staff. Pityriasis rosea. Mayo Clinic. Updated June 22, 2022. Accessed May 5, 2025. https://www.mayoclinic.org/diseases-conditions/pityriasis-rosea/symptoms-causes/syc-20376405
- Gawkrodger DJ. Pityriasis Rosea. In: StatPearls. National Library of Medicine. Updated September 18, 2022. Accessed May 5, 2025. https://www.ncbi.nlm.nih.gov/books/NBK448091/