Case report: an adult female known case of diabetes, stung on her foot on beachside with an unknown species, after which developed local symptoms of burning and pruritus, followed by edema of same foot a day later, anasarca followed days later. All other examination and investigations were within normal.

Conclusion: Most marine envenomation causes immediate reaction, which can be treated with simple first aid measurements and will rarely need medical intervention. We hypothesize that diabetes could interfere with the reaction process and delays the effect.