The box jellyfish found in inshore waters around northern Australia during the summer months is potentially fatal, but stings from most jellyfish are simply rather painful. Dousing in vinegar will de-activate any stingers which have not 'fired'. Calamine lotion, antihistamines and analgesics may reduce the reaction and relieve the pain. Bedbugs leave itchy bites in neat rows. Calamine lotion or Stingose spray may help.
All lice cause itching and discomfort.
They make themselves at home in your hair, your clothing or in your pubic hair. You catch lice through direct contact with infected people or by sharing combs, clothing and the like. Powder or shampoo treatment will kill the lice and infected clothing should then be washed in very hot water. They attach themselves to your skin to suck your blood, and trekkers often get them on their legs or in their boots. Salt or a lighted cigarette end will make them fall off.