Pityriasis rosea is a relatively common, self-limiting skin condition that primarily affects children, adolescents, and young adults. Despite its benign nature, its sudden onset, distinctive rash, and potential for misdiagnosis can be concerning for patients and caregivers. This presentation aims to demystify pityriasis rosea by providing an in-depth look at its clinical features, potential causes, diagnosis, and management strategies.

1. PITYRIASIS ROSEA

2. PITYRIASIS ROSEA
ETIOLOGY
EPIDEMIOLOGY
SYMPTOMS
DIAGNOSIS
DIFFERENTIAL
DIAGNOSIS
TREATMENT

3. A patient presenting with a single, oval,
erythematous herald patch followed by
multiple smaller lesions on the trunk and
back, tell the diagnosis based on the
image and its management.

5. An acute, self-limited, exanthematous skin
disease characterized by the appearance of
slightly inflammatory, oval, papulosquamous
lesions on the trunk and proximal areas of the
extremities.
INTRODUCTION

6. Etiology
Unknown. A virus (HHV-739 more
frequently, HHV-6 less frequently)
has often been incriminated, but PR
is not contagious.

7. Epidemiology
Age: Usually between ages of 10–35
years.
Sex: No gender predilection.
Season: Incidence lowest in summer.

9. Morphology
• Herald patch Is the first lesion of PR
and is seen in about 80% of patients.
• Oval lesions with wrinkled, salmon
pink cen- tre and collarette of scales at
the periphery.
• Scales are attached just within leading
edge and free towards the center

10. • Secondary lesions begin as scaly papules,
which enlarge to form oval annular
plaques similar to herald patch are
smaller, less scaly and less erythematous
than herald patch.
• Are arranged characteristically: the long
axis of patches runs downwards and
outwards from the spine, along the lines
of the ribs (fig tree or Christmas tree
appearance)

11. Sites of predilection
Trunk, along lines of cleavage.
Sometimes (in 20% of patients) lesions
occur predominantly on extremities and
neck (inverse pattern).

12. VARIANTS
• Inverse PR: When secondary eruption
is predominantly present on the
extremities and neck.
• Papular PR: When secondary eruption
is predominantly papular.
• Bullous PR: When secondary eruption
is predominantly vesicular.

13. Investigations
Serological testing to rule out syphilis
is advisable in patients diagnosed as
PR, as secondary syphilis can closely
resemble PR

14. Diagnosis
• Points for diagnosis PR is
characterized by: Presence of herald
patch (in 80% of patients).
• Eruption consisting of erythematous,
oval annular plaques with a peripheral
collarette of scales.
• Typical distribution on the trunk (fig
tree appearance)

16. Differential diagnosis
Herald patch (when alone) should be differentiated
from:
a. Tinea corporis
b. Secondary syphilis
c. Guttate psoriasis
d. Pityriasis lichenoides chronica (PLC)
e. Drug eruptions Gold, captopril, barbiturates and
penicillamine can cause a PR-like rash

17. Treatment
The disease is self-limiting, so only symptomatic treatment is
required

18. • IADVL textbook of dermatology
• Illustrated Synopsis of Dermatology and Sexually
Transmitted Diseases Fourth Edition Neena Khanna
• Google images
BIBLIOGRAPHY