Dermatographic urticaria

dermatographia: Familial dermographism is a condition also known as skin writing. When people who have dermatographia lightly scratch their skin, the scratches redden into a raised wheal similar to hives. Signs and symptoms of dermatographia include raised red lines, swelling, inflammation, hive-like welts and itching. Symptoms usually disappear within 30 minutes. The exact cause of this condition is unknown. Treatment mayinvovle use of antihistamines if symptoms do not go away on their own.

Endpoint definition

FinnGen phenotype data
diagram bullet diagram downward connector

Filter registries Inpat., Oupat., Death

Hospital Discharge: ICD-10 L50.3
Hospital discharge: ICD-9 7083
Cause of death: ICD-10 L50.3
Cause of death: ICD-9 7083

Check pre-conditions None

Include endpoints None

Check conditions None

Apply sex-specific rule None

diagram downward connector L12_URTICA_DERTMATOG

Extra metadata

Level in the ICD hierarchy 4
First used in FinnGen datafreeze DF2
Parent code in ICD-10 L50
Name in latin Urticaria derm[at]ographica

Summary Statistics

Key figures

All Female Male
Number of individuals 1057 832 225
Unadjusted prevalence (%) 0.41 0.57 0.20
Mean age at first event (years) 44.88 43.79 48.93


Follow-up Absolute risk HR [95% CI] p N
1998–2019 0.05 3.73 [1.97, 7.07] 5.3e-5 29
15 years 0.02 3.39 [1.71, 6.72] 4.9e-4 25
5 years 0.00 4.40 [1.98, 9.78] 2.8e-4 13
1 year - - - -


Index endpoint: L12_URTICA_DERTMATOG – Dermatographic urticaria
GWS hits: 0

Survival analyses between endpoints


before Dermatographic urticaria
after Dermatographic urticaria

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Drugs most likely to be purchased after Dermatographic urticaria