Pityriasis lichenoides chronica


parapsoriasis: one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis (red, scaly lesions), rather than by their underlying etiology. Neoplasms can develop from parapsoriasis. For example, it can develop into cutaneous T-cell lymphoma.

Endpoint definition

FinnGen phenotype data

321302 individuals

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Apply sex-specific rule None


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Check conditions None


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Filter registries

Hospital Discharge: ICD-10 L41.1
Hospital discharge: ICD-9 6962B
Hospital discharge: ICD-8 $!$
Cause of death: ICD-10 L41.1
Cause of death: ICD-9 6962B
Cause of death: ICD-8 $!$


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Check pre-conditions, main-only, mode, ICD version

Look only at ICD versions H.D: 10, 8, 9 ; C.O.D: 10, 8, 9


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Check minimum number of events None


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Include endpoints None


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Extra metadata

Level in the ICD hierarchy 4
First used in FinnGen datafreeze DF2
Parent code in ICD-10 L41
Name in latin Pityriasis lichenoides chronica

Summary Statistics

Key figures

All Female Male
Number of individuals 78 42 36
Unadjusted prevalence (%) 0.03 0.02 0.03
Mean age at first event (years) 50.03 50.32 49.69


Follow-up Absolute risk HR [95% CI] p N
1998–2019 - - - -
15 years - - - -
5 years - - - -
1 year - - - -

Age distribution of first events

Year distribution of first events

Cumulative Incidence


Index endpoint: L12_PARAPSO_PITYLICHCHRON – Pityriasis lichenoides chronica
GWS hits:

Survival analyses between endpoints


before Pityriasis lichenoides chronica
after Pityriasis lichenoides chronica

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Drugs most likely to be purchased after Pityriasis lichenoides chronica