Neobook — clinical reference

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ICD 10 code: L42

DESCRIPTION

A common disease of unknown cause, probably due to a viral infection as it occurs in minor epidemics
Most common in young adults but any age may be affected
The rash involves the trunk, neck and mainly proximal parts of the limbs
Presents as pink papules and macules. The macules are oval, and have a thin collar of scale towards, but not at the periphery of the lesions
The eruption is usually preceded by a few days by one larger, oval, slightly scaly area (“herald patch”), commonly found in the scapular area or abdomen. The macules on the thorax characteristically lie parallel to the long axis of the ribs (“Christmas tree” distribution)
The itch is usually mild and there are few or no constitutional symptoms. It is self-limiting within about 6–8 weeks

GENERAL MEASURES

Counsel on the benign but prolonged nature of the condition

MEDICINE TREATMENT

Children

Chlorphenamine, oral, 0.1 mg/kg/dose at night. See: dosing table

LoE:IVb²⁶

Adults

Chlorphenamine, oral, 4 mg at night

Note:
Chlorphenamine is sedating

If itch not controlled or more severe daytime itch, switch to:

Children: 2–6 years of age

Cetirizine, oral, 5 mg once daily. See: dosing table

Children > 6 years of age and adults

Cetirizine, oral, 10 mg once daily

LoE: IVb

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Standard Treatment Guidelines and Essential Medicines List for South Africa, Primary Healthcare, 2020-2024_Version 1.0_07 November 2024

Chapter 5: Skin Conditions_5.11 Pityriasis Rosea

Pityriasis Rosea

Drugs mentioned

ICD-10 codes