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

Long name Dermatographic urticaria
Hospital Discharge registry ICD-10: L503
Cause of Death registry ICD-10: L503
Level in the ICD-hierarchy 4
First defined in version DF2
Latin name Urticaria derm[at]ographica

Summary Statistics

Key figures

All Female Male
Number of individuals 844 655 189
Unadjusted prevalence (%) 0.39 0.53 0.20
Mean age at first event (years) 45.78 44.90 48.83
Case fatality at 5-years (%) 1.07 0.46 3.17

Longitudinal metrics

All Female Male
Median nb. of events per indiv. 1.0 1.0 1.0
Recurrence at 6 months (%) 35.55 35.73 34.92

Survival analyses between endpoints


before Dermatographic urticaria
after Dermatographic urticaria

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Drugs most likely to be purchased after Dermatographic urticaria