Severe delayed cutaneous reaction due to Mediterranean jellyfish (Rhopilema nomadica) envenomation.

During summer, Mediterranean Sea waters are invaded by a species of jellyfish designated as Rhopilema nomadica. Their tentacles contain numerous nematocysts loaded with a toxin that causes envenomation, usually expressed as immediate appearance of redness, burning sensation and papulovesicular eruption in the affected skin. We report a lady with a severe delayed reaction due to jellyfish envenomation that developed 2 days after contact with jellyfish tentacles.