<unk>  is an itching dermatitis caused by a hypersensitivity reaction to the immature nematocysts of larval-stage thimble jellyfish (Linuche unguiculata), sea anemones (Edwardsiella lineata) and other larval cnidarians. The cause is sometimes attributed to "sea lice" or "sea ants", but sea lice (Caligidae) are crustacean parasites of fish only. It should not be confused with swimmer's itch.
Seabather's eruption
Saddle sore
Butcher's wart
Skin fissure
Flat wart
Tar melanosis
Grocer's itch
Windburn