Urticaria
Type: Symptom
Definition
A skin rash triggered by a localized allergic reaction, often presenting as migrating linear wheals.
Clinical Details
Also known as larva currens, this pathognomonic rash is caused by the rapid subcutaneous migration of autoinfective filariform larvae. The movement triggers a localized, intense IgE-mediated allergic response, resulting in a raised, intensely itchy red track that can move several centimeters per hour. It typically appears on the buttocks, groin, or trunk.