humulene and Urticaria

Cannabis allergy is not commonly reported, perhaps due to the legal status of cannabis use and the difficulties of obtaining permission to test it. We report 3 cases of work-related cannabis allergy with features suggestive of a dermatitis, rather than a contact urticaria. Only prick tests were able to confirm the diagnosis. Identification of the cause of the rash was essential to direct work re-deployment.

Topics: Cannabis; Dermatitis, Allergic Contact; Dermatitis, Occupational; Humans; Skin Tests; Urticaria

Topics: Anaphylaxis; Cannabis; Conjunctivitis; Fruit; Humans; Male; Marijuana Smoking; Plant Leaves; Prunus domestica; Prunus persica; Rhinitis; Seeds; Skin Tests; Urticaria; Young Adult

Topics: Adult; Cannabis; Dermatitis, Occupational; Female; Forensic Sciences; Humans; Skin Tests; Urticaria

Topics: Adult; Allergens; Cannabis; Dermatitis, Allergic Contact; Dermatitis, Occupational; Diagnosis, Differential; Female; Forensic Sciences; Humans; Patch Tests; Urticaria

A 26-year aged non-atopic criminological technician reacted to hemp (Cannabis sativa) and hashish with urticarial eruptions on hands and lower arms, rhinitis and conjunctivitis. Rubbing tests with pollenrich hashish were strongly positive. As hemp antigens were unavailable a hyposensitization therapy with hop (Humulus lupulus)--a plant belonging to the Cannabacea family--was begun.

Topics: Adult; Cannabis; Conjunctivitis; Dermatitis, Contact; Dermatitis, Occupational; Humans; Hypersensitivity, Immediate; Laboratories; Male; Pollen; Rhinitis; Urticaria