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

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 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


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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 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 1919 801 1118
Unadjusted prevalence (%) 0.62 0.46 0.83
Mean age at first event (years) 51.48 46.59 54.98


Follow-up Absolute risk HR [95% CI] p N
1998–2019 0.02 1.51 [0.83, 2.76] 1.8e-1 175
15 years 0.01 1.09 [0.59, 2.02] 7.7e-1 89
5 years 0.00 2.37 [1.28, 4.37] 5.9e-3 59
1 year 0.00 3.29 [1.64, 6.59] 8.1e-4 16

Age distribution of first events

Year distribution of first events

Cumulative Incidence


Index endpoint: L12_SEBORRHOEIC – Seborrhoeic dermatitis
GWS hits: 0

Survival analyses between endpoints


before Seborrhoeic dermatitis
after Seborrhoeic dermatitis

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Drugs most likely to be purchased after Seborrhoeic dermatitis