Emergency treatment in hospital is needed in these cases.
Prevent insect bites and stings
There are some simple precautions you can take to reduce your risk of being bitten or stung by insects.
For example, you should:
remain calm and move away slowly if you encounter wasps, hornets or bees – don't wave your arms around or swat at them
cover exposed skin by wearing long sleeves and trousers
wear shoes when outdoors
apply insect repellent to exposed skin – repellents that contain 50% DEET (diethyltoluamide) are most effective
avoid using products with strong perfumes, such as soaps, shampoos and deodorants – these can attract insects
be careful around flowering plants, rubbish, compost, stagnant water, and in outdoor areas where food is served
You may need to take extra precautions if you're travelling to part of the world where there's a risk of serious illnesses. For example, you may be advised to take antimalarial tablets to help prevent malaria.