Seborrhoeic dermatitis


seborrheic dermatitis: A dermatitis that is an inflammatory skin condition resulting in flaky, white to yellowish scales on oily areas such as the scalp or inside the ear, which is caused due to a combination of an over production of skin oil and irritation from a yeast Malassezia furfur. The symptoms include itching, skin lesions and scales, redness, plaques and hair loss.

Endpoint definition

FinnGen phenotype data

392423 individuals

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Apply sex-specific rule None


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Check conditions None


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Check pre-conditions, main-only, mode, registry filters

Hospital Discharge: ICD-10 L21
Hospital discharge: ICD-9 690
Hospital discharge: ICD-8 690|70630
Cause of death: ICD-10 L21
Cause of death: ICD-9 690
Cause of death: ICD-8 690|70630

2 out of 7 registries used, show all original rules.


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Check minimum number of events None


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Include endpoints None


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Remove individuals based on genotype QC


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Control definitions

Control exclude L12_DERMATITISECZEMA

Extra metadata

Level in the ICD hierarchy 3
First used in FinnGen datafreeze DF2
Parent code in ICD-10 L20-L30
Name in latin Eczema seborrhoicum

Summary Statistics

Key figures

All Female Male
Number of individuals 2688 1129 1559
Unadjusted prevalence (%) 0.71 0.54 0.94
Mean age at first event (years) 52.97 48.33 56.33


Follow-up Absolute risk HR [95% CI] p N
1998–2019 0.04 2.70 [1.64, 4.43] 8.9e-5 260
15 years 0.01 1.50 [0.92, 2.46] 1.0e-1 121
5 years 0.00 3.05 [2.07, 4.49] 1.9e-8 90
1 year 0.00 4.09 [2.49, 6.73] 2.8e-8 24

Age distribution of first events

Year distribution of first events

Cumulative Incidence


Index endpoint: L12_SEBORRHOEIC – Seborrhoeic dermatitis
GWS hits: 1

Survival analyses between endpoints


before Seborrhoeic dermatitis
after Seborrhoeic dermatitis

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Drugs most likely to be purchased after Seborrhoeic dermatitis

Endpoint not on priority list, no data to show.