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.

Data source
FinnGen phenocode L12_URTICA_DERTMATOG
Hospital Discharge registry ICD-10: L503
Cause of Death registry ICD-10: L503
Level in the ICD-hierarchy 4
First defined in version DF2
DOID 743
GWAS catalog 1000685
MESH D014581
SNOMED CT 7632005

Key figures

Sex All Female Male
Number of individuals 621 479 142
Unadjusted prevalence (%) 0.36 0.48 0.19
Mean age at first event (years) 46.18 45.15 49.65
Case fatality at 5-years (%) 1.13 0.63 2.82

Longitudinal metrics

Sex All Female Male
Median nb. of events per indiv. 1 1 1
Recurrence at 6 months (%) 34.94 34.45 36.62


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