Pityriasis rosea is a mild inflammatory skin condition characterized by salmon-colored patches that are initially discrete but may become confluent. It begins with a single large "herald patch" followed by smaller oval patches covered with dry scaling skin. The rash typically resolves spontaneously over 3-8 weeks. It occurs most often in people ages 15-40 in the spring and autumn, and affects more women than men. While itchy, pityriasis rosea is usually not serious and resolves on its own without treatment.

1. PITYRIASIS ROSEA
Dr.Alaa Mohammad AbuZaineh
Teaching Assistant
RAKCOMS
RAKMHSU

2. • Pityriasis rosea is a mild inflammatory exanthem
characterized by salmon-colored thin papules
and plaques that are at first discrete but may
become confluent
• The individual patches are oval and covered
with dry epidermis, which often desquamates,
leaving scaling in the center.

3. • Starts as single herald or mother patch
• larger than succeeding lesions
• persist 1 week or longer  disappears  new
lesions appear for 3-8 weeks (total course of
the disease)  resolves spontaneously
• Moderate pruritus may be present(during
outbreak) and mild constitutional symptoms may
occur before the onset.
• Relapses and recurrences is rare
• The incidence is highest
• between ages 15 and 40,
• in spring and autumn.
• Women than men

4. When stretched across the long axis, the scales
tend to fold across the lines of stretch  hanging
curtain sign

5. Christmas tree sign.
• These are arranged so that the
long axis of the macules runs
parallel to the lines of cleavage.
• The eruption is usually
generalized, affecting chiefly
the trunk and sparing sun-
exposed surfaces.

6. • Purpuric pityriasis rosea may manifest with petechiae and
ecchymoses along Langer lines of the neck, trunk, and proximal
extremities, and may rarely be a sign of an underlying leukemia.
•
• Pityriasis rosea occurring during pregnancy
• associated with premature delivery, neonatal hypotonia, and fetal loss,
especially if the eruption occurs within the first 15 weeks of gestation.

7. Etiology
• A response to a virus.
• most commonly human herpesvirus (HHV)–6 and HHV-7.
• A pityriasis rosea–like eruption may occur as a reaction to medications

8. Treatment
• Resolves spontaneously
• Most patients asymptomatic  no therapy required
• Inadequate evidence for efficacy for most published treatments
• Trials
• acyclovir  decrease the eruption and itching.
• In pregnant patients, given the small risk of harm to the fetus early in pregnancy,
acyclovir could be considered along with input from an obstetrician to help weigh the
risks and benefits.
• Corticosteroid lotions or creams  relief itching.
• simple emollients  Dryness and irritation

9. Thank You