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Pink patches on the trunk
Pityriasis rosea: one larger patch comes first, then the others. And then it passes.
It has such a characteristic story that it is often recognised from the account alone. First a single patch appears, larger than the rest, oval, pink, with fine scaling at its inner edge: the «herald» patch, and for days or a couple of weeks it stays alone. Then, suddenly, the trunk fills with smaller oval patches, arranged with their long axis parallel to the rib lines — a pattern recalling the branches of a fir tree.
Those who develop it are frightened, understandably: the eruption is extensive and arrives within days. Itching is variable, often mild. But the outlook is good: it is a self-limiting condition, resolving spontaneously over some weeks, generally between four and eight, without leaving permanent marks — at most a transient hyperpigmentation in darker skin types.
Two things still make the visit worthwhile. The first is differential diagnosis: the picture can resemble other eruptions treated completely differently, and telling them apart is clinical work. The second concerns pregnancy: pityriasis rosea in pregnancy is a situation to report and assess, and it falls outside the general reassurance of this page.
It resolves on its own, but the diagnosis needs confirming
It is a picture that frightens more than it warrants, and reassurance is legitimate: in the great majority of cases pityriasis rosea burns out spontaneously within weeks leaving nothing behind. The reason to have it examined is not the course but the name: several trunk eruptions look alike to the naked eye and some require investigations or treatments not needed here. A visit settles the matter and allows you to wait calmly rather than in doubt. In pregnancy, however, it should be reported and assessed separately.
How it shows
- An initial larger, oval patch with scaling at the edge
- Subsequent appearance of smaller patches on the trunk
- Arrangement with the long axis along the rib lines
- Pink or brownish colour, with fine scaling
- Variable itching, often mild
- Usual sparing of face, hands and feet
How we proceed
- 1Dermatological visit: recognition of the herald patch and the distribution
- 2Differential diagnosis with other trunk eruptions
- 3Targeted investigations where the picture is atypical
- 4Management of itching, where present
- 5Reporting and dedicated assessment in case of pregnancy
Available treatments
- Dermatology visit
- Differential diagnosis
- Management of itching
- Later review
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Frequently asked questions
Is it contagious?+
It does not behave like a contagious disease: no restriction of contacts, work or school is required, and cases within the same family are rare. It is one of the first questions asked, understandably, given how extensive the eruption is and how quickly it appears. In practice there is no need to isolate or change your habits.
How long does it last?+
Generally between four and eight weeks, with real individual variability: some resolve sooner, others take longer. The patches tend to fade gradually, leaving at most a transient pigmentation, more evident and longer-lasting in darker skin types, which then fades. It is not a course that can be much accelerated, and it is useful to know so as not to chase treatments.
Does the sun help or make it worse?+
Moderate exposure is sometimes reported as favourable for the course of the patches, but it must be balanced against the risk of accentuating pigmentation differences during resolution, especially in darker skin types. In practice: no intense exposure and no sunburn, which on inflamed skin is the worst thing. It is one of the points to clarify at the visit, because the answer varies with phototype.
Related reading
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