title: Delayed allergic dermatitis presenting as a keloid-like reaction caused by sting from an Indo-Pacific Portuguese man-o'-war (Physalia utriculus).
abstract: Cnidarian envenomations are common occurrences in the tropics that can affect holidaymakers. The cutaneous reactions are classified as immediate or delayed types. Delayed allergic reactions are persistently recurring dermatitis, which can occur within 1-4 weeks from the initial sting, and may last for several months. Hypertrophic scar-like or keloid-like reactions are rare, and are believed to be a type IV hypersensitivity reaction to sequestered antigens from stinging filaments. We report an unusual case of delayed allergic dermatitis with keloid-like presentation caused by Physalia utriculus.
authors.affiliation: Department of Dermatology, Southern Philippines Medical Center, Davao City, Philippines.
authors.forename: B E K
authors.initials: BE
authors.lastname: Guevara
authors.affiliation: Department of Dermatology, Research Institute of Tropical Medicine, Muntinlupa, Metro Manila, Philippines.
authors.forename: J F
authors.initials: JF
authors.lastname: Dayrit
authors.affiliation: Department of Dermatology, Botucatu Medical School, São Paulo State University, São Paulo, Brazil.
authors.forename: V
authors.initials: V
authors.lastname: Haddad
mesh_terms: D000818:Animals; D001706:Biopsy; D001733:Bites and Stings / Q000150:complications*; D003876:Dermatitis, Atopic / Q000209:etiology* / Q000473:pathology; D006801:Humans; D037402:Hydrozoa; D007627:Keloid; D008297:Male; D013997:Time Factors; D055815:Young Adult